Nope.
It's true that we don't actually know if Lindell had any evidence that could somehow legally influence the 2020 election. Given the absurdly tiny chance of that being true then we are left with two choices:
A. Lindell's "evidence" was just a bunch of BS.
B. Lindell had an actionable plan to commit treason and overthrow the government.
Conspiracy as a charge ONLY works if you have proof option B was the definite and only possible plan Lindell intended to carry out. Otherwise we'd have a situation where the government is charging a private citizen who's done nothing but criticize it, albeit vehemently and vocally. Regardless of how annoying said citizen is, his right to free speech and freedom of assembly guarantees he can be heard by whomever wants to listen. Again, you'd need a seriously bulletproof case with loads of evidence to convict him on conspiracy.