Yes I have seen this. Nearly every Albanian noble family is considered of Serbian/Greek origin. I didn't want to post Wikipedia, but it was the quickest thing I could do at the time.
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Only for Serbian and Albanian users (for understanding). Albanian historian about Skanderbeg!
https://www.youtube.com/watch?v=I5qWJTRm5aU&t=22s
Well Skanderbeg's maternal Slavic origin isn't something unknown. As for the flag part, that was used out of context and the rest was edited. The historian probably would've carried on saying that Skanderbeg's flag was based on the Byzantine one and not that he raised the exact Byzantine flag. He didn't say that he raised the Byzantine one, the video creator edited it to seem as such though. He raised the Kastrioti banner, which in turn was based on the Byzantine one.