Tom knows the range on each of kenshi's moves, so he's baiting sc and not afraid to throw ice from the right ranges on a good read. If you notice, Tom also uses the breaker to keep kenshi in the corner but never when he himself is in the corner. It's just good meter management and good footsies/reads along with remaining methodical by not being perturbed by Kenshi's zoning.
Still a really hard matchup for Sub, but you can see the basic reasons for why Tom probably does a lot better than other Sub's in his difficult matchups...