What diseases has Gates eradicated? Polio has been surging back and nOPV (which Gates stands to generate a lot of personal wealth from, by the way) has been a bit of a bust. Measles is going strong, too, and Malaria seems to have been a bit of a token effort for Gates.
You may want to check your numbers because polio type 2 and type 3 are both still around (in fact, cVDPV type 2 is very, very common). The GPEI website has the recent numbers, updated weekly (although with ~3 month lag).
400k to 4k is not 400k to 0. Eradication means 0. People don't get smallpox vaccines today because we hit 0. American children get ~4 doses of IPV still, despite what you are claiming as "eradication."
Attributing that whole reduction to Gates alone is a ridiculous thing to do. He didn't even fund most of the project and the only thing he really brings to the table is money. This has been a multinational effort with literally millions of people for 3 decades. Gates mostly wrested control from them in the last decade.
If he manages to bring the project over the finish line, I will celebrate his achievement. At this point, signs point to failure of the GPEI being a near certainty. Unfortunately, we'll be back to 400k in about 10-15 years if we give up at this point.
I am not conflating cVDPV with WPV. The parent comment claimed type 2 and type 3 polio were gone, which is not true. WPV 3 and WPV 2 are gone, but type 2 and type 3 polio are both still around. If you get polio today (unlikely but possible), there's a pretty good chance it's cVDPV 2.
So you you're saying you knew the two types of polio were eradicated but inexplicably assumed the parent comment must have meant the vaccine-derived poliovirus was eradicated. Or you think these are the same virus because you saw "type 2" in the names of both.