Besides throwing everything at the other side (known in legalese as "papering" the sons of bitches) whether the pleadings make sense or not, Trump wants to slow down the wheels of justice so that he suffers no convictions or sustained civil verdicts before the November 2024 general election.
Any sort of conviction or judgment against him might turn potential voters against him, and lose him the Presidency, and if he never becomes President he can't pardon himself or delay the trials even longer.
For example here
Trump Urges Supreme Court Not to Fast-Track DC Immunity Claim
you'd think he'd want to Supreme Court to consider his immunity claim in the criminal election interference case, but that would rob him of the time delay benefit of having the DC Circuit consider the matter first, and then go on to the US Supreme Court. Trump's lawyers know their immunity claim is a straight loser, but they want to drag things out as much as possible.
Hell why not, delay is always on the side of the defense (unless the defendant screws up and picks up new charges while out on bail), and as long as unsuspecting donors are funding Trump's multi millions in legal fees, why not waste the court and everyone else's time with superfluous motions and delay tactics?
If you can't win, delay!