Haha~! And yeah, it seems like the artist may have been underexposed to BSSM (and some of the other classic stuff). And that's the funny thing! Technically, it isn't!
Nagai-sensei didn't make it as one, but when the first anime rolled around, it really picked up with the female crowd and it does have traits close to the genre (especially like the original magical girl stuff before BSSM came around), so it's one of those mixed deals there.
It's really funny and interesting how the genre has changed. Magical girl now is nothing like what it is before (outside of empowering girls, but I think it does that better and more now on average, with the exception of shows like Madoka, but it's also made by guys and aimed at guys, so they weren't looking to be a true magical girl show anyway), and I think Honey herself and the series lie just on that line of the things that are modern and classic to the genre.
Because Naoko Takuechi liked sentai stuff and her editor's encouraged its addition, BSSM really shifted the genre, and shows like PreCure picked up and carried on with that. It's kinda... Well, I just don't know the words entirely, but it is quite interesting.
And it kind of made me think of magical girl shows in general, the ones that changed the genre, deconstructions and parodies of the genre and how they compare.
A lot of people don't really consider Utena a magical girl show, but it is regarded as one and is a magnificent deconstruction of the genre (as well as shoujo and shounen themes and genre as a whole). Whereas shows like Nanoha and Madoka are just... Well, most people see them as deconstructions, and they try to be, but I don't really think they are the way people see them as. (I think it's because people think, "oh, girl's show, so no violence or death or darkness." And so when a show is violent or at all dark - but not aimed at girls -, people go "oh! A deconstruction of the genre!")
I read these really good articles of sorts about that matter (one of them
here). It falls into how shows aimed at girls are generally regarded as needing excuses to be good and the expectations and assumptions have of them. It gets weird especially with magical girl fandom, especially because of the demographics, lol.
Sometimes, it's more fun to keep track of the way people in magical girl fandom act and associate than keeping up with the shows themselves.