I mean, you're tecnically correct in that the number is no longer accurate. But actually the change has been in the other direction. That link is talking about

I mean, you're tecnically correct in that the number is no longer accurate. But actually the change has been in the other direction. That link is talking about the CFR, not the IFR, and the CFR is up to 7% these days. (170k dead out of 2.5M confirmed cases). No credible source that I saw ever suggested that the IFR was 3%, and that is not what any decisions were based on. Everyone knows that some cases will be missed. The early IFR estimates were all huge ranges like 0.1%-2%, precisely since there was so little information early on about how many cases were not being detected. (And it is surprising how little we've managed to narrow that range down). There are other claims in that WHO link that are obviously wrong in retrospect. E.g. the claim that Covid transmits less efficiently than the flu.