Not really. Super Smash Bros. often re-uses voice clips, with Sonic recycling voice clips from various games using Roger's voice such as Sonic Generations, although re-using Sonic's drowning sound from Jason Griffith's lines recorded for Brawl, so if Dr. Eggman was going to appear in Super Smash Bros. Ultimate, or any Smash games, its highly likely that they would just re-use voice clips from various games Mike Pollock voiced him in, thus Mike wouldn't know about it.
He also didn't confirm or deconfirm anything, simply stating he wouldn't talk about it once again.