Upvote:34
That particular website, well ... its not very credible. Its part of Wikia, a site designed for Science Fiction/Fantasy fans to create their own wikis. In other words, things don't get deleted/removed/edited out there just because they have no relation whatsoever to reality. This person's Wikia site reuses the name of the defunct precursor to Wikipedia, which I find highly dishonest and misleading.
Outside of that website, I could find one other decent reference to this supposed Alphabet: from a Mormon website.* It claims this is the alphabet used by the speakers of "Adamic", supposedly the world's first language, spoken by Adam and Eve, and also currently spoken in Heaven. In other words, this is somebody's religious belief.
The current scholarly consensus is that the Greek Alphabet is was copied from the Phoenician Alphabet. Technically this was an Abjad, not an Alphabet, as Semitic languages have predictable vowels, and thus don't usually need to bother representing them in their writing. Indo-European languages like Greek don't have that feature, so the Greeks had to re-purpose some unneeded Phoenician consonants to indicate vowels. This is how the Greeks managed to get credit for the first Alphabet, even though all they really did was hack an existing Abjad to work for their language.
Here's a comparison chart of the two Alphabets, taken from the Greek Alphabet Wikipedia page just now.
* - Not linked, as I don't believe it deserves the page-rank bump.