Spec subject to change without notice is one thing, but the honest approach to that is a change to equal or higher value.
If you bought something based on spec and then they promptly removed all the XT and replaced it with Deore, and then pointed to the small print you’d be p’ed off. The counter is that it is there in front of you.
I’d get the card out, buy it, and then immediately return it on the basis the wheelset is not as advertised and hence the RRP is irrelevant and misleading. They can either put the original wheels back on, or discount a few hundred more to compensate, or refund you.