Wikipedia is fair to cite Odgers's review. But the nature of the available evidence means that Odgers would be overstating her case to say that Haidt's theory is conclusively wrong, and Haidt would be overstating his case if he claimed to be conclusively right.

You see, the effect on social media on socialization has two parts. The first is the direct effect on an individual caused by their own use of social media. The second is the effect on an individual's social environment when everyone around them is on social media. The first effect is difficult but basically feasible to study. The second effect is downright wicked. So dismissing evidence that hints at the second effect as being "mere correlation that disappears under scrutiny" is not valid reasoning when your process of scrutiny focuses on the first effect.

In social science you have to accept reasoning from incomplete data. You won't always have the answers. I don't think Haidt really stands above or below his peers in any category except notoriety. Of course anyone who has worked with scientists knows to be a little suspicious of a researcher who seems to enjoy being in the public eye. But as the public eye, we're still stuck with them.