Having no evidence is not the same as being wrong. For instance, I can claim there is a flying spaghetti monster in heaven watching over us. My argument would

Having no evidence is not the same as being wrong. For instance, I can claim there is a flying spaghetti monster in heaven watching over us. My argument would be unfounded, with no supports to attack, but an assertion to the contrary would be similarly wrong. There is essentially no way to disprove it. Of course OPs statement is arguably one that is able to be disproven, or at least evidence towards disproving it. Unfortunately, the person claiming it was not sophisticated enough failed to provide that evidence. So in my book, they both made unfounded statements.