No, I need a more reliable source than some random YT video. At least with a news article you can trace it to a real human writer and an institution with some kind of track record. That's why I gave a link to a news article from before the election, to show that the idea of a "red mirage" wasn't made up after the fact. You could show me the same respect, or you can expect me to dismiss your claims as baseless.
I found a source clarifying my statement about ballot counting order. Some states start counting mail ballots before election day and some hold them until election day. Pennsylvania accepted mail ballots postmarked up to election day even if they arrived later, but they stored them separately. There are several entirely mundane reasons that stored ballots might be brought out late in the counting process. It would be up to the person claiming something out of the ordinary were happening to show good evidence.
"Also, for the 2020 General Election, counties may continue to accept ballots that are
postmarked by November 3, 2020 and received by mail through Friday, November 6, 2020. But these
ballots will be kept separate from those received by 8 PM on November 3, 2020."
https://www.votespa.com/About-Elections/Documents/ENR_111020_1403.pdf