No, a pay bump on EX3 itself was part of the EX3 KS. Twice I think, in fact. Rates are ongoing things that apply across the company for all the work a freelancer does.
If a freelancer posts that their pay rate caused problems with delivering a project, that's their legitimate personal take on a situation. When we say that there is a difference between full-time creative staffs and teams of freelancers that are doing their RPG work as a second or third job (which is most of our folks), and this can cause problems, pay rates are not usually the issue. Usually it is available time.