The “artist’s rendition” looked Indonesian. The surname appears Indonesian. “Bernard” isn’t very Indonesian, though.
The artists rendition was of a different suspect in a different fire.
I am looking as a picture of BS now (I can’t share it - it’s online but I don’t violate Australian court orders personally) and he doesn’t look Indonesian.
Sokaluk is a Slavic name of Russian / Eastern European (Polish, Bulgarian) origin.