It is certainly not "common knowledge" but just a fabricated version of history spread by Serbian writers in the 19th-20th century that became famous where they basically claim all the Albanians that revolted as Serbs.
Pretty much every historian that has bothered looking at the sources of these events agree this was an Albanian revolt organized by the Albanian Catholic Pjeter Bogdani and Toma Raspasani, that included both Muslims and Christian Albanians. There were also some Serbs among these Albanians.
https://en.wikipedia.org/wiki/Pjetėr_Bogdani
https://en.wikipedia.org/wiki/Toma_Raspasani
You can read this book
Rebels, Believers, Survivors: Studies in the History of the Albanians from page 128 he tells the fabricated versions then from page 134 he tells the real version, he has used all the sources and documents from 1600's
Arnaut was a Turkish word for Albanian
https://en.wikipedia.org/wiki/Arnaut
And here is a German text from 1689 that mentions they were greeted by Albanians
1689 Kosovo in the Great Turkish War of 1683-1699
They refer to Prizren in Kosovo as 'Capital of Albania' , Archbishop of Albania and Patriarch of Clementa refers to the Albanian name Kelmendi i.e Pjeter Bogdani and Toma Raspasani, they wrote themselves they met the Austrians, and many Albanian Catholics fled to Hungary after the revolt where they died of hunger. They never specify 20,000 Serbs alone. There were also some Serbs among these Albanians. There were also both people fighting on the Ottoman side such as the Albanian Ottoman lord Mahmut Begolli
Here they mention 20,000 Albanians:
Here they mention 5,000 Muslim Albanians:
Prizren was an Albanian Catholic town in the late 1500's and became mostly Muslim Albanian in the 1600's, Western Kosovo was mostly Albanian in the 1600's.
Show me a single source from the 1689 century that mentions they were greeted by Serbs or Arsenije ? It is completely nonsense. Just a fabricated version of history you have been taught.
Most historians who have studied this topic with actual documents from these timesalso agree there is no evidence 30k-40k refugees ever left that place or were led by Arsenije or that he led any kind of resistance against the Ottomans or that they were ''replaced by Albanians from a mass immigration'', Arsenije was in Montenegro during the revolt then fled through Peja in Western Kosovo and to Belgrade and wrote himself in a letter nobody was able to get out of Western Kosovo, which was also mostly Albanian. He took the 30k-40k refugees in Belgrade , bunch of refugees that had gathered from all over the place basically, some were from Eastern Kosovo thad had been able to flee.
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