That is completely irrelevant, the gross part is that (if true) they are demanding them to be fixed in a given time. Sounds like the epitome of entitlement to me, to say the least.
No one is demanding anything, the report itself is a 90 day grace period before being publicly published. If the issues are slop then what exactly is your complaint?
It’s a reproducible use-after-free in a codec that ships by default with most desktop and server distributions. It can be leveraged in an exploit chain to compromise a system.
I'm not a Google fan, but if the maintainers are unable to understand that, I welcome a fork.