The "did not land" video they're talking about, that was his response to people being mad at him for calling Mamdani an Islamist (and being "from a culture that lies about everything"). Also, "partially" is doing a lot of work there: he starts that video saying "cancel culture is alive and well" and doesn't in fact back off at all from his claim: the "did not land" part is even just Maguire lamenting that he accidentally helped Mamdani by targeting him.
Anyway, when he went after the Brown student saying he was "very likely" the shooter (also bringing in Mamdani again), he did less: he simply deleted the video.
Oh - thank you very much for the correction, I must have been reading the article too quickly!
What an asshole. He could have gotten the kid killed, not to mention the damage to his social reputation. And he can't even manage a "sorry if you were offended" non-apology.