The point of the embargo was to prevent all rumors? But it did not hold.
Anyway, GPs point is that even if nobody leaked anything, and the only thing publicly known was the existence of the bugs, people would anyway have been able to find them independently. So what is the purpose of waiting 24h before releasing the patches?
Finding an exploit and publishing is is not against the law. In some cases, publishing immediately is the responsible thing to do. For example, when it's actively being exploited in the wild, and waiting just puts people at risk that don't have any recourse to protect themselves, since they don't know they're at risk. There can be nuance to that as well, but in general, as soon as it's being exploited, anything that makes it harder for end users to a) know there is an exploit, or b) tell if they're susceptible to it (e.g. through a POC) is just taking away people's ability to take the action they deem appropriate.