But I think the broad point in the short post is right. Objective-C may look horrible today, but compared to the other choices at the time of its debut; it looked pretty damned good and even better because it was what NeXT was attaching its UI tooling to -- and compared to what was around at the time InterfaceBuilder was unreal good.
So I think it makes Objective C more of Michael Angelo Batio.
Besides, as far as I know, Objective-C only ever gained traction within the very narrow realm of MacOS and iOS application development, and has since been mostly supplanted by Swift in both of those use cases. That's hardly comparable to the enduring, cross-cultural influence of Hendrix.
If we're making weird anthropomorphic analogies, I'd argue Objective-C is more like Sleep, People Under the Stairs, or maybe The Replacements. Enormously important within the scope of their own subculture.