Roman Greek historians or writers in general describing contemporary peoples with classical names is not really a measure of their reliability, given how it was a simple convention of them. It is just a case of Greeks being unable to be confined in their own century, and having to constantly make allusions and references to the past, as if they have misplaced in their mind the nomenclature of their present time, as if they were not aware on which century they live. I would even say that calling Albanians as "Illyrians" is rather standard, as others like Laonikos Chalkokondyles would sometimes call them "Macedonians", which is rather unusual, but even that does make a bit of sense, considering that Epirus Nova was part of the Macedonian Prefecture. The only real far cry in that direction in the above excerpts is referring to Hungarians as “Paeonians”, despite how the latter lived South of the Triballians, and the former lived North of the Serbians (whom the Greeks of the time called “Triballians”, like Nikephoros Gregoras).