The linked conversation looked pretty civil - looks as though you decided to step down, which is entirely reasonable, but I don't see anything forcing you or imposing anything on you.
If Google wants bugs fixed in open source software, they should also submit a PR with the fix, or provide a bounty for the fix.
The way this is done is an unveiled threat (if it was my library, I'd tell them as much. Deadlines are for vendors or employees, not for free libraries).