Sorry, you're right. They are literally Japanese. I meant that they aren't going through the standard Japanese manga pipeline with official publishers, editors, magazines, organizational advertising etc. The ones that are mostly self-produced like the one you listed are wild cards, and don't really have a standard to follow.
Well... that's what I typically think of when I hear Japanese manga. Kinda like when people say comics and recall spider-man, marvel, DC, etc. Though, these days a lot more are entering that same pipeline from standalone webcomics.
BTW, is "My Boss is Scary" short for "A Scary Boss, But From Now on She's Going to Be Happier and Happier"? I kept searching for it, and that long title kept coming up.