@frontendjulien It's this one:
Link Preview Image GitHub - akhoury/nodebb-plugin-import: migrate your old crappy forum to NodeBBmigrate your old crappy forum to NodeBB. Contribute to akhoury/nodebb-plugin-import development by creating an account on GitHub.
faviconGitHub (github.com)
It's been awhile, and it only imports a forum to an older version of NodeBB, but upgrading afterwards is pretty straightforward.
Otherwise I would still recommend contacting Lincoln Russell to see if he's interested in helping you out.