Invisible Kid is confirmed to be Lyle. But since we don't see him, he could be black or Asian or Latinx or something other than white, which I'm fine with.
I prefer Lyle to Jacques anyway. He always seemed to never know what he was doing and just luck his way through things, I prefer the scientist and stealthy version of an Invisible Kid. So let's hope Bendis keeps him in character.
Judging by the one line of dialogue Lyle has... he could be. Could
it does make Jan's weird pose even weirder, like I thought he had bumped into Lyle, but the speech bubbles clearly show that's not what's happening...