No, but there should be a precedent for someone to claim there is a precedent.
Your argument is essentially that every possible variation on every half-baked idea in every fragment of "elseworlds" Batman media, no matter how esoteric and no matter in which medium, will come to pass in a large budget Hollywood movie.
Believe whatever you want, but how about doing so in some kind of "fan-fiction/theories" thread?
I don't understand the obsession of it. People would prefer a hokey twist to the greatest archrivalry in all of comics.
Can we please start a petition to ask David Ayer to make an official statement that Jared Leto is not Jason Todd?
There's nothing implying that Lex is Clayface...or that Clayface is Lex.No more than anything else that is simply made up.
Perhaps Lex Luthor in this movie is not the real Lex Luthor but is really Clayface. The real Lex Luthor is tied up in a basement somewhere. And he's bald.
That theory has the same amount of validity, the same amount of "evidence" in its favour, provides the same kind of fan-service to those who dislike the new interpretation of a character that we are getting, and actually does far less harm to the characters involved.
So there we have it. Lex Luthor is Clayface.