I think that them threatening the 25th against Trump even though he called for peace is grounds for Trump to invoke the insurrection act and prosecute all the traitors. Read between the lines.
Hes not saying Biden will be inaugurated and then the 25th will be used on him. That would be pointless unless Kamala is also implicated.
He also might be saying that, if the Senate should break their own rules, he'll just resign, making impeachment impossible, and let Pence pardon him.
Theoretically it should be impossible to use the 25th on him because the Senate is in recess until the 19th. But you know how much they care about rules and constitutionality these days...
Trump would never resign