Eh, literally everything can be a buzzword. "Email" has been a buzzword in the past, as has "Internet" and "mobile phone" and so on.
It's not like web 2.0 which isn't a newer version and also not like serverless when it has servers or cloud which isn't a cloud.
Btw. this isn't about how new it is. Just look at stuff from the 90s. The terms they also didn't stick.
Also those things had a specific well defined meaning.
Like again web 2.0 didn't. User created content, Ajax, etc. all surround that.
Not saying buzzwords can't become meaningful, but they are still buzzwords.
Also they still are wrong when they are something like serverless, which is just plain wrong.