I assume that's what this is about, but I have no idea why FBarnhill wouldn't just say as much, because it certainly isn't self evident. Some light googling tells me a few unofficial fan sites have pushed the "fun fact" that Creature is inspired by The Deep Ones, but yeah, I can find no official source to corroborate that. No mention of it by the film's writer, directors, or makeup and creature designers. It's a connection someone drew at some point and ran with it. At this point, though, there's nothing to be upset about here.