Hello: Thomas English Muffins are less than 1/60 milk. I once had an email exchange with the OU on this subjuct and will try to dig it up and post it.
IIRC, The tzemach tzedek says that there is also an issur of ein mevatlin with even less than 1/60. THe nachlas tzvi argues but I think that most achronim go with the tzemach tzedek.
However, since bedieved anyways it would be kosher, and I assume that Thomas is a non-jewish owned company, I can understand a svara that there’s no issur of ein mevatlin with goyim.