This is straight up lies following an argument you had with a trans person ive quoted for you as stating they will vote, that you cited as an example of telling you to abstain.
Bidens losing to Trump all on his own. You can rally behind a better, younger candidate already available, or replace Biden with a better, younger candidate.
If it's happening, I imagine it's something along the lines of "Biden did bad things to trans people. If you vote for him, you don't support trans rights. And Trump is even worse! Don't vote/vote third party. " There are other issues where I've seen this argument, not specifically for trans folks, though.