To answer to the original question: I think it depends on the recruiter and interviewers. Some would not be aware or not care where you got your hours as long as you can prove you are a proficient pilot. Others will know about those airlines and care about it.
Take for example some members of this board that are against P2F or that do not like the idea of flying on those blacklisted airlines; they might be your recruiter/interviewer or part of the selection process, and you will most likely not get hired by someone like that.
I myself would give a very hard time to an applicant during an interview if I were an interviewer and I knew the applicant had his/her time in a P2F scheme and in a blacklisted airline.