Apple didn't offer a distinct higher end Mac Mini line. They had various configuration options of the same model. Some ready made with better options. They were still on the same motherboard and layout. Therefore the same model. They're all even called the Macmini8,1. It would be like considering $1,799 and $2,299 27" iMac different models instead of different options of the same model.
Apple simply discontinued the base config. Normally in the past when they dump the base config but keep the higher config available. They drop the price of that config to base. This time they didn't.
With 13" Intel MacBook Pros they offered two distinct models. Along with other lines offering distinct models. Even the 21.5" iMac had different model designations for the 1080p and 4K models.
While Apple's free to do what they want. I'd consider the M1X a distinct new line. If they're going to offer two different models going forward. Sort of a Mac Mini and Mac Mini Pro. With either the M1 or M1X being the actual replacement for the Intel model. Then we'll just have to wait and see if they'll continue with M2 + M2X lines or shift the M1X price down and offering an M2 at the higher price point.