What does it mean "Xiaomi EU port rom"?


Hi guys, I don't know if is the right section, however this morning I found this thread on XDA https://forum.xda-developers.com/redmi-note-9-pro/development/port-masik-x-16-0-t4145143 and the author named his rom "xiaomi eu rom" based on miui 12. I checked if stable miui 12 is released on this forum but not, so: what does it mean "Xiaomi EU port"? Is an authorized port or the author "robbed" your work? Is reliable rom?
simply said:
It is a pale copy of the original One!
 
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