> Minor revision releases will include deprecation warnings and tips for how to upgrade an API or pattern that will be removed or changed in the future.

16.3 is including dep warnings and tips to upgrade, check.

> We will continue to release codemods for common patterns to make automatic upgrades of your codebase easier.

Probably will be there closer to 17 release.

> Once we’ve reached the end of life for a particular major version, we’ll release a new major version where all deprecated APIs have been remove

Once 16.x end of life is reached, the next major version, 17, will remove the deprecated APIs, check.

They are literally following exactly what they said.