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It's 17th century, not 15th. I admit to not understand Latin, and I took that source I believe from the Albanian project. However the paragraph goes: 
Castoria urbs tradens appellationem ex cognomine fui auctoris, nimirum praedcti inuistissimi e fortissimi epiroti principis georgij castriotae; a castriota, castoria corrupte nucupatur, castoria castra
A translator from Latin would be useful. Now since this was written 2 centuries after the death of Skanderbeg, the last of the Kastriotis to be in Albania, wouldn't it be considered a secondary source?  Let's talk  "