I mean, young people have been dramatically more pro-Palestine since long before social media. Grain of salt and all, but I don’t think it’s a wild claim on its face, especially once you account for the nature of network effects / filter bubbles.
I think they're probably right, in that it's not just their algorithm that has had this impact. It's all the algorithms, their social circle, the propagandistic media that's not fed by an algorithm but designed the old fashioned way such as TV, and of course their faculty of reason which is often discounted when we talk about this sort of thing.