Votes are still being counted. There are numerous disputes about which ballots should be counted and possible fraud.
It ain’t over till it’s over.
UPDATE: I updated the title to include a question about the original tweets about RCP allegedly rescinding their call. While it is possible that the original tweet was simply a misunderstanding, my opinion is that the tweet about RCP has been a brilliant tactical move / practical joke. It blows a giant hole into the left-wing news bubble. In order to debunk the tweet, they have to admit that RCP never called Pennsylvania and never has declared Biden to be their “President-Elect”. Of course that debunks the media narrative that the election is already decided.
They have not applied them that people who have claimed the Biden has already won even though votes are still being counted in swing states with likely recounts and court cases. Nor have they applied them to comments such as these, calling for blacklisting anyone who refuses to accept the media narrative about the election:
Tapper and his colleagues have done the their best to resist, ignore and invalidate the 2016 election results. That included repeated false reports about related the false narrative about Russia collusion. Is Tapper saying that CNN should fire him base on his own behavior for almost four years?
The basis for confusion is that your original thread title was repeating false claims from people on twitter, like the one in this post it seems you still don’t understand is not true. Then you changed the topic completely with a new thread title.