Even though the phrase "the godfather of ..." suggests otherwise, it's really not a competition or an attempt to determine the exact origin of "close-up card magic", it's just acknowledging the fact that Juan Tamariz has contributed a lot to the art form.
That, however, doesn't diminish Dai Vernon's or Erdnase's contributions, but yeah, not a competition.
If we're going with "contributed a lot", then there are a tons of great card magicians to mention: H.N. Hofzinser (the real father of card magic), Richard Turner, Cardini, Charlie Miller, Jimmy Grippo, Rene Lavand, Bill Malone, Juliana Chen, Michael Vincent, and Shin Lim (off the top of my head -- I'm sure I'm missing someone)
Sure, but rattling off a bunch of names doesn't really say anything about what they've contributed and what impact it had. This piece is specifically celebrating Juan Tamariz and his contributions to close-up card magic.
I don't see why we can't celebrate someone for doing something without having to mention everyone else who's also done something. No one is diminishing their contributions but they're not the topic of the article. If you want to write an article about them, I'm sure someone would be happy to publish it.
