You can find plenty of exceptions for all of the points, but most of the things you said will have most-all of those. Finding the exception doesn't discount all of those as common themes from RPGs. And no the dungeon is not an open world it's a closed world. It's one giant area. Very contained.
As for the so called sidequests in the Castlevania games I don't call most of them optional-- most of them are needed to progress they're just not presented that way. Or they're optional but it's more hassle to not do them than to do them.
And I guess by non-scripted I meant non-mandatory for any quest or sidequest-- the script doesn't send you to them you talk to them yourself for the fun of it or for hints or whatever.
Anyway, I'm just saying that most sources Castlevania is not an RPG, but an action game or a platformer. There's too much different and not enough similar with CV and most RPGs.. like I said there are almost as many ties with CV as there are dozens of completely not RPGs. You arbitrarily say that leveling and stat manipulation/items make something an RPG. I can say a party building dynamic does and I probably end up with a lot less false positives than you do with not many false negatives. Thing with RPGs is you can't narrow it down to one or two important statistics cause all the defining characteristics are broad.
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No problem!
This is a cute and pop genocide of love!