I don't know if you've noticed this about Stein voters, but they're very unlikely to switch their vote from Stein to Harris. If anything, there would suddenly be an unexplainable surge in write-in votes for Putin.
You fundamentally misunderstand the people you speak authoritatively about. Please remember that voters and supportive posters on the internet are not the same thing. I agree that Green Party voters (actual human citizens, not bots and trolls online) are woefully misguided but they are not trumpets by any stretch. Have you talked to any of them in person?