Whether or not it will happen remains to be seen. Certainly I won't deny that among the people who have faith in the media (Biden supporters) they are convinced it will happen.
The election is a legal process and it's declared him the presumptive winner. Same as Trump on election night in 2016.
Everything else that happens are formalities, however important and necessary. Other than the 2000 election, we haven't waited this long to announce the next president following a presidential election.
And it isn't even close, Biden has more differential votes by percentage than Nixon, Truman, or Reagan.