Releases Page - Semantic Versioning Description

I was wondering why it is written in Releases Page the following text mentioning semver.

Releases are based on Git tags. We recommend tags that use semantic versioning, for example v1.0 , v2.0-pre

The official site semver.org has a regex validator and these notations above are not valid.

Wouldn’t it be better changing this to match the common sense?

Regards,