The logic and wording may change slightly. It may be < 8.0.0 in the future, rather than < 8.1.0. I haven't fully decided yet.
On the one hand, I think it's reasonable for people to have older versions brought to their attention, and PHP 8.0 is 4 years old this year. On the other hand, thinking about where we might want to be in the future, if we made PHP 8.0 the minimum requirement in, say, XF 3.0 or XF 3.1 then it's probably reasonable to call out people running below 8.0 rather than below 8.1.
Either way, I think now XF 2.2.14-15 has much better PHP 8.2 compatibility, the underlying message still stands: we recommend upgrading.