(Though, on the other hand, maybe it's more just honest signaling of expectations. "We are a 0.x project, we value developer speed and a clean code-base more than backcompat or stability for users. We will NEVER grow up!" We could call it Peter Pan versioning.)
No.
It says that there's no universal agreement on this one thing, and while if you want to sell to certain people you should tailor your versioning appropriately, there's zero point in assuming a single interpretation. If I use CalVer some people who think there's only one way to do this may assume the product has had 2021 major version releases.
That would be a silly assumption.
This really should be the term for projects that are perpetually releasing 0.x versions.
Maintainers are free to release their software under whatever terms that they wish, but if you actively encourage people to use your software and do not want to maintain backwards compatibility, then IMO, you should be very honest about that.
Similarly to https://www.hyrumslaw.com