Yes because it is like when someone says 'all lives matter' in a response to events where black people are under attack and people say black lives matter. All lives do matter, but in this specific instance, we're talking about black lives, as they happened to be the ones under attack.
Of course all communities should be protected, but if Starmer stands there in a press conference specifically about the violence and intimidation shown against the Muslim communities says 'we need to protect the Muslim communities' then it's just nonsense whataboutism to say 'well actually, you should protect all communities'. It's adding noise and muddying the water for no reason, and we already know what Musk's intentions are. He wants these far right rioters to burn down every mosque they see. He's been goading them and egging them on since this all started.
I'm sure he's broken one or several UK incitement laws.