The Maduro schtick is obviously B.S. because that's just one of his games to suggest that crime is so horrible in the USA that it's better in places that Americans consider scary countries like Venezuela, which actually is scary for various reasons but that's another story.
HOWEVER, the idea of Trump fleeing the country rather than facing losing the election and then likely the rest of his life in prison isn't far fetched at all.
But it wouldn't be Venezuela.
There would be numerous other options.
I have heard the idea that Trump might be interested in making a deal to avoid prison in exchange for shutting up for life, hiding away in Margarine Lardo, and not inciting a civil war. In theory not a bad deal for the country but I can't imagine how such a deal could be possible structurally as his cases are federal and state and such a deal would be basically extra-judicial.