@andrai886,
I'm not 100% sure but I think all 3rd party OEM Radeon VII cards are basically a re-badged version of the AMD reference design so any Radeon VII should work with MacOS, very similar to when AMD released the water cooled version of the Vega 64 ... all 3rd party OEM cards where basically a re-badged version of the AMD one.
Amazon UK has the same XFX Radeon VII in stock :-
https://www.amazon.co.uk/dp/B07NFGDZWQ/?tag=tonymacx86-21
£559 is a very good price for a brand new Radeon VII given that they where £799.00 in the UK when first released, and most other on-line stores in the UK are selling Radeon VII for around £650 at the moment, it might still be worth waiting for Black Friday/Cyber Monday for an even better deal .. although £559 is cheaper than some used ones i've seen on eBay.
Cheers
Jay