Were that the case we'd have evidence of the "Material culture" of these cultures, yet we do not. Conversely, we have literally TONS of archaeological evidence

Were that the case we'd have evidence of the "Material culture" of these cultures, yet we do not. Conversely, we have literally TONS of archaeological evidence of Neolithic hunter-gatherer people spread across the entire world during these so called "Lost ages" so personally I think it's preposterous to assume that somehow some advanced civilization that left absolutely ZERO trace of it's supposed grandeur existed beside a hunter-gatherer civilization for which we have plenty of archaeological evidence. It's a certainly fun through experiment to think of some lost ancient civilization with glittering cities and high technology that was ground down to dust by the last ice-age, but there's literally no factual evidence to support such a notion and plenty of factual evidence to disprove it, so it's best not to get sucked too far down that particular irrational rabbit-hole.