This is inaccurate.
VoteHub still is projecting a Harris win, https://polls.votehub.com/
They're not the only ones, see also https://app.vantagedatahouse.com/analysis/TheBlowoutNoOneSeesComing-1
As for votes not mattering - exchange third party voters in swing states and offer a vote swap. Multiple safe state voters can swap with a single swing state voter, leading to a win for the third party (more votes so closer to 5% of nationwide popular vote that'd get them federal funding) and for Dems as well (more Harris votes in swing states).
Longer term, there's a plan afoot to fix this, https://www.vox.com/2020/1/14/21063591/modest-proposal-to-save-american-democracy-pack-the-union-harvard-law-review
Once that goes through we can do things like ranked choice voting and such as well as a direct nationwide popular vote for the Presidential election, which should solve this for good - and prevent the Dems from needing to cater to the most centralist voter - or moderate Republicans - to win.
Have hope!