The original argument was that "being pro vaccines is not left wing" and you then provided a counter argument that conflated Biden being skeptical of what the prior Trump administration was claiming about a yet to be released vaccine with him being skeptical of vaccines. These are two vastly different things and conflating the two in an effort to make the point you just did shows that your argument is based on politics and not actual facts.
Or perhaps you are one of those who believe every claim being made, even when it comes from someone you would never trust? If you don't, why are you basing your argument on that premise, that Biden should have accepted everything Trump claimed about a vaccine?
Also, the quotes provided are taken out of context, let's add some context to the first one from Aug 5, 2020:
The fact is that the way he talks about the vaccine is not particularly rational. He's talking it being ready. He's going to talk about moving it quicker than the scientists think it should be moved. It matters to let the people know that it is all transparent, exactly what the facts are. Let the medical community writ large speak to it so that there's transparency. Look, I think people are going to, as the poll show and we talked about it today with the two docs and my staff, that in fact people don't believe that he's telling the truth. Therefore, they're not at all certain they're going to take the vaccine. One more thing, if and when the vaccine comes, and it's not likely to go through all the tests that needs and the trials that are needed to be done, and the question is, is he going to seek emergency move? Well, I think it's really important right now. I proposed a $25 billion plan for the distribution to guarantee that every single American has access to the vaccine because what's going to happen, you know as well as I do, if the vaccine came out tomorrow, how in the heck would we get it to people? There is no game plan they have. How would everybody in America have access to it? It is a gigantic, gigantic problem to distribute, even if we have it. That's we should be planning for now. Now. Not when we get it.
The other quote from July 28, 2020 which also was taken out of context, here's the context:
But I want to say it again, I'm going to keep saying it. The president, as we speak, should be starting and should have started three months ago to put someone in charge of how specifically, like waging a war. How are you going to distribute the vaccine when it arrives, when it arrives, when it's there? And the question of whether it's real, when it's there, that requires enormous transparency. You got to make all of it available to other experts across the nation, so they can look and see. So there's consensus, this is a safe vaccine. Because already you have, what percent is American people saying if the vaccine were there tomorrow, they wouldn't take it? And it's not the usual anti-vaccine crowd it's beyond that because people are losing faith in what the president says. Think about it.
See how much more sense it makes when we have the contexts from which the quotes was unceremoniously yanked out of. It's almost like it was intentional to make people think Biden meant one thing when it's the opposite.
You can find the whole transcripts here: https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.rev.com%2Ftranscript... and https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.rev.com%2Ftranscript...
TL;DR: Being skeptical about what one man says about a topic isn't the same as being skeptical about the topic.