Have you come across 'Tonatlan' before? And is there any legitimacy in saying that Tonatlan is more 'proper' than Tulan?
I assume these are some of the problems you might be referring to. If so, I'm anxious to see what your research will find...
So far just a tiny issue. The author is debunking the notion of the etymological relationship between the "TUL" root in Tulan with "TOLtecs". Worst case scenario, I guessed wrong about an ancillary discovery that doesn't have a direct bearing on Atlantis itself.
Although the article is giving as much as it's taking away. It supplied the interesting nugget that the Nahuatl name for the Tzutuhils was Tecpan Atitlan, or "Nation of Atitlan" (with Atitlan being an alternative representation of Atlan, Aztlan, or "Atlantis").
Tonatlan isn't a problem, etymologically. Just a footnote, etc.