That's an impressive attempt to rescue the statement, but he didn't say “No Trump supporter scaled the walls”, he said “No one who scaled the walls was a Trump supporter.” While in a formal logic sense, of no one scaled the walls the latter would be true, it's not something anyone basically familiar with spoken English would use to express that concept; it is what you would say to acknowledge that the wall was scaled and deny the people doing it were Trump supporters.

And, in any case, forcible entry did occur, both through positions on the perimeter surrounding the building (prompting the perimeter to be generally collapsed as the guards at other points were then surrounded) and at some of the external entrances to the building (of which there is video), and at internal barricades (in one case, prompting deadly force to keep the mob away from withdrawing threatened civilians.)

And in some of those cases, there were people known to have been Trump supporters involved.

So, it's both an implausible interpretation and even if it was what he was claiming pretty clearly false, too.