We won't call it armed robbery, we'll call it a simple assault, stuff like that.
On the surface of it stuff like that seems nefarious, but in reality very few of these conspiracies stand up to scrutiny. Mainly because the thing one is a statistics of is also included in other statistics so it's trivial to see the co-contribution of such a renaming in official figures, and yet it never actually appears.
It's like the people who complain that unemployment is being played with because they stopped counting people who gave up looking for work, except there has always been 6 different measures and they've always been defined and measured the same way.
Reclassifying crimes is easy to spot, you can't just hide a crime in some other statistic.
Maybe the threat of heavy handed law enforcement had an effect.
But while the first part of your post is correct, the title of it is just plain fucking stupid. ICE / National Guard have zero to do with these crimes and don't do any enforcement of them. The reality is for nearly a decade there's been a steady increase in normal police focus on these crimes, and this has very much lead to an increase in the chance of getting caught which *may* influence the crime rate.