OK, I'm legitimately curious to know more. I do remember him talking about "making insulin as cheap as water" or something like that, but can you point me to the actual executive order or bill he was trying to pass that dealt with this issue of lowering the cost for prescriptions? A source about Biden overturning whatever it was would be great as well.

I don't preclude Trump from having actually done something meaningful, but a lot of what he does is vain and self-promoting, so I could easily see this being a case where he tried to put something into effect that looks good on the surface but doesn't actually accomplish anything, or doesn't accomplish it in a sustainable way and thus would need to be revoked to prevent prices going up in the long term.