NonImpeditiRationeCogitationis,
Even framed that way, it leaves plenty of room to discuss what exactly qualifies as a fundamental postulate where faith based thinking takes over. Is the statement that lashon hakodesh, or the formation of its letters, is ancient and original, a fundamental postulate, or is it more like a white swan?
Ramban quoted above states that lashon hakodesh is Canaanite (or that people of Canaan spoke lashon hakodesh). It had nothing to do with its similarities to Phoenician, so it wasn’t a concession based on scientific evidence. Ramban emphasizes that the kedushah derives from the fact that it is the language the Torah was given in.