I mean, there’s no counter petition (nor should there be) so it’s pretty tough to know whether those 1,200+ are representative.
Where I work, if someone is ousted, people might talk about the person’s toxicity or whatever got them fired one on one or in small groups, in a pretty off the record kind of way.
I’d bet the people who agree with the petition think it’s representative and the people who disagree think it’s not representative (“people are generally like me” is a reasonable prior).