Outside of the obvious errors (They rarely perform at SDC anymore, the park isn't in a cave, and I'm dubious on the claim that they are the most popular show- that would depend on how you measure it)...
It's very cool that they are mentioned. We've really enjoyed the show, but there are a few shows that I would put right up alongside them as being just as good, and just as popular.
But the writer's credibility is completely destroyed when they argue that the USS Midway Museum is the most popular attraction in California (been there, it's cool, but it's not Disneyland) and that Speedboat Sightseeing of Miami is the most popular attraction in Florida. Ummm, yeah. Maybe really cool attractions that are often missed? But I can't even see those being the most highly rated on Trip Advisor, let alone the "most popular"