Inviting the incoming POTUS to the White House is common practice. Obama did it with Trump.
With respect to the 2020 Pres Election, there simply is no way that Biden received a legit 81 Million votes from 81 Million legit voters. This is why comparing any 2020 voting numbers of any specific group of voters, (Male, Female, Black, Brown, etc), to the 2024 election results is a joke. 1960 is now commonly accepted as being a Stolen Election. Likewise, the 2020 election will at some point also be recognized as being stolen. There simply is no way that Biden received a legit 81 million votes. And many of these alleged 81 million votes were tabulated in crucial swing states several days After the election ended. Back in his day, LBJ would have been unbeatable with the use of voting "drop boxes" being placed on every other street corner.