@Blabladodo I can see where you get your idea at, it is true that "guro" has a vast range for some, I think that on the subreddit, choking can be considered as guro because of the actual meaning of the word, guro is short of "grotesque" and not gore...
But while those "fans" have a wide range for guro content, I believe that as long that internal organs like intestines don't appear, it won't be guro.
Sure amputation might be considered guro for the "hardcore fanatics" but to most, unless they actually show in a graphic way the amputation, it's not considered guro.
This is what I unknowingly learned after all those years on the internet, I don't even like guro, but you sure learn thigns if you're open to knowledge.
So basically, amputation does fit in the definition of guro(grotesque) but it does not fit within the tag definition, unless you show the amputation in itself.
So yeah, only ryona