TL:DR version: Snoke’s mind bridge was intended for them to communicate, not the whole physical stuff which is contributed to the Dyad stuff. He didn’t know that, just wanted them to chat.
Fair enough. The problem I have with that is it isn’t made clear enough in the film that this is the case. I actually would blame TFA in this case. If TFA overtly set up that they had some mystical connection, it would be more believable that Snoke’s mind bridge would accelerate it. The problem, at least in my case, is that when Snoke says that line it appears that he is taking credit for everything, not just the chatting.