UX is a broad term which includes UI Design. Why would the interface which a user is using would not be part of the experience?

https://uxdesign.cc/ui-vs-ux-is-not-a-thing-28aef994fddc#:~:text=UI%20is%20part%20of%20UX,and%20UI%20for%20User%20Interface.&text=The%20user%20experience%20is%20the,limited%20to%2C%20a%20user%20interface.