But it doesn’t, actually. The only thing that Tour’s purported facts can establish is that we don’t know how these compounds first originated, it doesn’t follow from that, that they couldn’t. From our mere ignorance nothing follows. For Tour’s case to hold some logical force he would have to show that a very large fraction of all possible options have been tested, or that he has calculated/simulated the outcomes of a large fraction of all possible chemistries under all possible physical circumstances.
But neither is actually the case. Tour’s case is analogous to looking for a particular rock on the continent of Africa, searching the bathroom floor of a particular apartment in Cairo, and then concluding the rock probably isn’t in Africa. It’s absolutely absurd.