Trump encouraged people like Giuliani, Powell, his son and a bevy of others to continue the lie of a stolen election with baseless claims..A know liar, a known fraudster, a known untrusted man that has you convinced only he tells the truth and the other hundreds of officials that are not known liar, fraudsters or cheats are untrustworthy in the eyes of the cult of Trump.
There is no proof that saying the election was stolen is a lie just because the facts were refused to be heard. There is plenty of evidence that election laws were changed, ballots went missing, some voting machines were compromised, etc. That, in fact, is more evidence than Democrats had when they wire tapped Trump with an illegal FISA warrant.