He is one of the authors of the BIP proposal but there are five more. So they all agree on those points in Phase B.
I don't know what to think. It feels like choosing between two evils, hoping you picked the lesser one. Allow satoshi-era coins to be stolen if a strong-enough quantum computer becomes a reality. That would cause a devastating affect on the network. The alternative looks even worse: freeze the coins and effectively take them out of circulation for the greater good of the network and again destroying trust in Bitcoin and censoring it.
I think everyone is overestimating the effect of this. All it does is reintroduce more supply into circulation. Once it happens, it is done and the network has swallowed the solution to the problen. We are not talking about something that will kill Bitcoin for example by completely breaking it. One of the reason why people are exaggerating this is because everyone has been writing about this is a very negative way for a long time. If it is something that is an expected progression of the networks evolution, and if we start talking about it as something that must happen and something that is normal then the fears will get lowered.