No, the consensus I’m seeing is that PA doesn’t require a postmark. So that ballot could be mailed on Nov. 4 or 5 and still arrive in time. I haven’t read the opinion, but that’s what “conservative Twitter” is saying at the moment.
Correct, no postmark or valid signature required and 3 days to run the laser printers.
Trump should impound all US mail in processing at midnight on November 3rd.