Are you 100% sure?? Can you link me.Checkra1n is available at 14.4.x and works on an X
How long has this worked for? People have been saying for a while that the X was only jailbreakable on 14.3 and below.I have it running on my 14.4.1 iPad pro...
Googles is your friend:
Although it says not supported you will have to go select allow untested iOS versions in settings