Hmm, well, thought I'd have a quick look into this ghost town to see if it had gotten any more interesting since devolving to echo chamber status but alas, no, there's more traffic in a desert still but hey ho, for a laugh and nostalgia I'll address this laughable nonsense.
Spoiler alert: The conservative party in the UK is - like most if not all political parties - utter crap and I'd no more support them than I would attempt skiing down the Eiffel Tower.
This being said, the silly little "tweet"you've posted seems to fail to take into account that any party representing "modern Britain" in the UK is already including "Anglo Saxons" so there's no need to point out a major demographic. So, with that out the way then hmm:
A Jewish prime minister? Nowt wrong with that apart from tripe from wingnut anti Semites.
First female prime minister? Nowt wrong with that either on the face of it. Unfortunately I grew up with Margaret Thatcher at the helm so to speak and was a shame she lasted in power as long as she did frankly. The last female prime minister Liz Truss has pretty much the shortest term in such a position effectively but that's not because of her gender, just abysmal ineptitude in office, something plenty of Caucasian men have been guilty of and for a lot longer...
First black chancellor? Kwasi Kwateng, yeah, wasn't done any favours by having Liz Truss as PM but didn't do himself any favours either. Faults lay neither with gender or skin colour but just risible policies that caused the downfall of both politically speaking.
The first Muslim home secretary? Suella Braverman, Yeah, she's a ray of sunshine isn't she? Well, hardly, but again gender and religion have squat to do with that.
First British Asian Prime Minister? Rishi Sunak. Yeah, again, wouldn't get my vote but nothing to do with his heritage or anything but rather because the conservative party is a farce as with politics in general.
In conclusion, diversity is great!