Unfortunately, there are people that take that "we really don't know for sure" comment as a negative as "proof" of whatever thing they are pushing instead. The internet is full of them.
Science is not a set of facts caved in stone. Science is a process; a way of thinking critically and exploring the boundaries of reality in a way that makes a best effort at getting closer and closer to the boundaries of the knowable in a rational and reasonably-objective way. It often makes missteps and corrections along the way, and we can acknowledge that openly while also contrasting it to non-science junk that isn't even on the right track.