"and all Canaanite dialects are mutually intelligible": That is the definition of a dialect.

Also, I don't know how you can claim Hebrew is phonetically represented by its alphabet rather than the other way around, as a revived language the pronunciations are largely a matter of convention based on Yiddish. It would be more accurate to say that modern Hebrew uses an ancient writing system, which happens to be closely related to the ancestor of modern European alphabets.

See https://en.wikipedia.org/wiki/Revival_of_the_Hebrew_language