It's a widely repeated claim that the alphabet was invented only once:
Britannica:
The invention of the alphabet is a major achievement of Western culture. It is also unique; the alphabet was invented only once, though it has been borrowed by many cultures.
David Deutsch (2011):
every alphabet-based writing system that has ever existed is either descended from or inspired by that Phoenician one.
Denise Schmandt-Besserat (2014):
Because the alphabet was invented only once, all the many alphabets of the world, including Latin, Arabic, Hebrew, Amharic, Brahmani and Cyrillic, derive from Proto-Sinaitic.
Frank Moore Cross (1991):
The alphabet was invented only once. All alphabetic writing derives ultimately from an Old Cannanite alphabet and its immediate descendant, the Early Linear Phoenician alphabet.
William Flexner (2004):
the alphabet was invented only once: There is, strictly speaking, only one alphabet in the entire world. All alphabets in use or known ever to have been in use — the Hebrew, Greek, Roman, Cyrillic, Arabic, Sanscrit, Tamil, Korean and all the rest — trace in one way or another to the alphabet developed, perhaps in some way out of Egyptian hieroglyphic writing, in the ancient Syria-Palestine region.
Is the above true?
Isn't for example Hangul an alphabet that was invented independently (did not descend from and was not inspired by the Phoenician/Near East one)? (Wikipedia also suggests several other possibilities.)