No, that's a very silly take on a very straightforward post. Skin colour doesn't come into it at all.
'understands nothing of Britain except what it can give him' = only in it for the money. That is a Tory trait, not an ethnic one. There are plenty just like him, and they come from a range of ethnic backgrounds.
You may have been disgusted by their conduct, but it’s clear that there is no way you’d have questioned their Britishness if a white PM had done the same.
Quite simply not true. When I posted to say that I would slate any PM of any ethnic background or party affiliation who did the same thing, OP fully agreed with me. One can be legally as British as anything and yet not give a shiny shit about Britishness - this is what Sunak has done. He did it out of electoral opportunism, nothing else - and nothing to do with his ethnicity./
You're looking for racism where for once there isn't any.