Those seem to be leaves primed from a single plant, top to bottom from left to right. First leaf on the left is mature-to-ripe, second is ripe, third is ripe-ripe and so on. It is (I’m quite sure of this) a white stemmed burley strain. And the guy is not exactly well informed about tobacco leaf chemistry or curing methods, to say the least. FTT is a waaaay more reliable source of information than YouTube.
pier