I agree with everything except that the I think the paper, and other papers in general, should be judged on their merits alone. The credibility of the authors should not influence how the paper is judged.
Definitely. Using credibility, or any other metric, to determine what to review is fine. Using credibility as part of the review itself is not something I agree with.
With respect to publishing, there is a significant volume of work, and we should be able to keep up with it long as people review as much as they publish.
You seem to be conflating the problem of weak or no pear review (i.e. the reason why paper-mill publications are shitty), with the problem of judging a paper by the author's name and not purely by its content (i.e. what the OP proposed).