What this effectively means is people can’t rip out WebAssembly support from CPython.
The hope is we can hit tier 2 in October, which would mean WebAssembly support will block releases if it’s broken. Since it would be the first platform promoted to tier 2 since the tiers were introduced, I don’t know what will exactly be required beyond the WebAssembly buildbot saying up and stable along with supporting WebAssembly not being a massive burden. My suspicion is any other requirements will simply be due to trailblazing such a promotion and not specific WebAssembly.