Trump could now argue he, as sitting president, was threatened in his functioning by the new president elect, and it was an official act to block the transfer of power as long as the sitting president has concerns about the validity of the votes. (Ofcourse he always has those concerns)

And now with the coming elections he will claim the same and as a bonus he officially and in the open has the republicans refuse to certify a losing vote because that also threatens his position and impedes his functioning.

If the lower courts now claim his acts were not official he will just appeal that back to the Supreme Court, thereby still delaying any closure of the case well after the elections.