I don't think people are advocating for Lex to be a 1:1 of Musk, just the same as Trump, Zucks or Jobs but rather taking parts of them to create the ideal Lex that we can see is possible in real life based on the inspirations.
It wasn't that long ago that people were very pro Musk and didn't see him as this idiot that bought Twitter, he was someone selling the idea of a better future, self driving cars, better rockets all while under this guise that "maybe" he was the genius one that came up with all this... we know that isn't the case but the general public ate it up until more information came out over time.
Trump is much the same but with causing division in the world, being a billionaire all the while playing to the average Joes of the world, once again with the idea of creating a "better" America and as much as a horrible, racist, sexist bastard that he is... he still became the president and we all know how that played out.
If you take just these 2 ideas and smash them together with a bit of comic book you pretty much get an ideal Lex that feels all too real, and this is just looking at this idea simply.