Well I have to let you into a little secret.
Wagyu cattle only has to actually be 75% pure breed Wagyu to be legally called 'Wagyu'.
I watched a documentary a couple of months ago with a farmer who is raising Wagyu in Scotland, he bought a 100% pure breed Wagyu embryo for £400 from Australia and has crossed that with his domestic beef, then puts the bull back over it's offspring to get 75% Wagyu (or something like that).
Even on the packet of that Aldi steak it says........
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"Selected from cattle sired by registered pedigree Wagyu bulls"
Which means the father was a pedigree Wagyu, not the mother.
It's a bit of a scam tbh.