Though, there is a good reason even Elon Musk called that survey/poll to be highly lacking of scientific base, it is because people who are more likely to vote for Donald Trump are followers of Elon Musk on Twitter, not even mentioning the polls does not exclude people living outside of the USA and not having the right to actually vote in November.
So this poll it will likely be used by some Trump followers as some kind of proof of the massive support Trump is having, while in reality, there is no validity on it.
Also, even though Elon is obviously a person with much influence and has lately become a popular culture character, he would need to do more than that in order to move the odds of either Kamala Harris or Trump in this high liquidity betting market.
He has already openly endorsed Trump, by the way, so no much left he could do.