Just saw on Mastodon that the Resynthesizer plugin will be ready to use with GIMP 3.0
Along with other third-party plugins developed for GIMP, like G’MIC and BIMP, Resynthesizer is so integral to our workflows that it’s easy to forget that it’s not part of the core project.
Sounds more like they’re just making sure the plugin is compatible on release of GIMP 3.0. It’s still a [separate] plugin.