Don't worry, when reporters asked his campaign about a very easily provable fact on a live-broadcast and widely recorded event, they said this:
In an emailed response to an inquiry about the lisp from a Huffington Post reporter, the Trump campaign said, “Must be your s****y hearing. Get your ears checked.”
Problem, I don't think many of said staffers do as evidence by this brilliant response to a journalist asking about why trump suddenly had a lisp in this interview
https://www.independent.co.uk/news/world/americas/us-politics/trump-elon-musk-interview-x-stream-lisp-b2595384.html
The lisp was present throughout and takes like 2 seconds to find clips of it and hear it