>>12446857They said something in the lines of "oh it seems it's strong against Ice, maybe it's Steel?". It was more in the lines of "it broke the Ice so MAYBE it's SE against it so MAYBE it's a type SE against Ice so LET'S TEST STEEL".
The only types 100% out are Steel and Fighting (besides Eevee and its evos', but that was old news). It was HEAVILY implied that Poison was super effective but, as it was not explicitedly stated, cannot be taken for granted. Same thing with its relationship with Ice, we only know that Sylveon can break it. It could mean anything from "it's a type SE against Ice" to "it knows a move neutral to Ice", or even "it has enough Attack to break a fucking block of ice so it's not Base 20".