The guest presenters are Nobel laureates and several have won both awards in both directions

Most of these are answered in paper and the Ars Technica article
Operating temperature 110 C, so quite do-able for a stationary power source and very small overhead with good insulation
After 500 cycles battery capacity is over 80% of initial spec
Energy capacity similar to Li-ion
and don't mix with water -> H2S (poison and flammable) noted now so can be part of good design

Lots of opportunity for use, as a storage as part of wind and large scale solar panel farm

It is molecular corrosion not chemical corrosion as others have noted, it is still corrosion, that is deteriorates the object. In text books it is hydrogen embrittlement. It makes the metal brittle by penetrating between the crystals, makes a void and breaks the metal. The higher the pressure the worse the problem, or use expensive alloys and put the price of the tank up 250%.

Hydrogen burns as soon as it cat
Minimum explosive limit is about 5% - H2 in Air similar but lower than natural gas
Maximum explosive limit is about 70% - H2 in Air - nat gas is 18%
explosive limit is where a flame can start and be sustained

Flame speed H2 is about 5 times that of natgas - so it gets away from you real quick
Calorific value is much lower than nat gas - so you need more of it for the same amount of energy
Corrosive as anything - so it destroys your pressure storage vessels,
what you say corrosive, it is not chemical action it is molecular action
the molecules of H2 get between the atoms of the steel and make holes in the steel and then break it.
so on all points not good

Here is Aus NiFe cost 30% more that a Pd-Acid system. Lithium are the smallest and good for 4000 cycles
Pd-acid are done at about 7 to 10 years
NiFe need monthly maintenance and once a decade electrolyte replacement but otherwise they keep on going

Ni-Fe beat Pd-Acid as they out live by several cycles so that 10* price advantage is gone.
Now to google some prices.

They are good for adding to your house solar system, but terrible for a car of phone (use Lithium here). The operational life of 20+ and some have done 50 years is also good for your house and for adding to remote systems to provide charging for a car. The other issue is they are not maintenance free, they need electrolyte top ups monthly/quarterly.

Priced at about the same (energy storage basis) as lithium and last twice as long.

https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FNickel%25E2%2580%2593iron_battery

The metals are nickel, which is mined in Australia, Canada, New Caledonia (part of France), and iron (most of the planet).

quoting wikipediaThe nickel–iron battery (NiFe battery) is a rechargeable battery having nickel(III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets. It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, and short-circuiting) and can have very long life even if so treated.[7] It is often used in backup situations where it can be continuously charged and can last for more than 20 years. Due to its low specific energy, poor charge retention, and high cost of manufacture, other types of rechargeable batteries have displaced the nickel–iron battery in most applications.

Hydrogen is a very difficult fuel to use
Flame speed is 5 times that of air+methane
Explosive limits are 5% to 75% air + H2 whereas methane is 8% to 18%
It is very corrosive in steel and needs very expensive materials for tanks that will last, with steel a new fuel tank every year for domestic safety would be needed.
Low specific calorific value, it takes more kgs of fuel for a standard distance
Fuel tanks will need to be pressure vessels which are heavy

look at Beirut, but it depends on the angle it hits the atmosphere, straight down Beirut, sideways many windows broken, near miss off shore coastal flooding, near miss inland forest fire. Local damage only.

There is still a significant amount of energy to be dissipated, this rock is about 10% of the volume of "Chelyabinsk meteor", so a release of energy similar to the recent Beirut blast. This a sky show and shock wave in the mid Indian ocean according to NASA,

I did a photo stream with a Renaissance (1595) dance track as the background, generated by a synth on this PC and YouTube stung me for a copyright violation for a piece 410 years old.