It really comes down to the charity or intent or understanding of those calling out 'lies'.
If I tell you my product cures cancer when I know it doesn't, that's a lie.
If I tell you my product is best when I know it isn't, there's a gray area in there between lying and salesmanship.
If I say I told you that exactly 100 times when I know I didn't, that's a lie.
If I say I told you that a million times, we both know I didn't but it is just using hyperbole to emphasize a point.
Are those who believe in God and say so lying in the eyes of an Atheist who argues there is no evidence of any kind for that? If Trump and many others believe the 2020 election was stolen and say so are they lying when the media, etc. say there is no evidence that it was?
Being wrong is no more a 'lie' than believing in a flat Earth or that the Holocaust was faked or Elvis is still alive makes that belief a lie.
Is it a lie to be wrong or exaggerate for emphasis?
Or is a lie an intentional act to deceive?
My definition is a lie is intended to mislead or deceive.
Those who say Trump lies seem to believe if it isn't verifiably true, then it's a lie.