The pre-release tarball looks good, assuming that we will be the only users of this release that are upgrading from the previous release. I feel we should at least have a pointer in the changelog to [comment:17] for anyone upgrading from 6.2-1.16.0. I've updated this comment to make it easier for others to follow.
So, hmm, I think it's safe to assume that we're the only users of this release. But just in case somebody else runs their own Onionoo server and has never contacted us yet, what's the worst thing that can happen? It will take about a week for their responses to all follow the specification again. The only reason why we're using the tool from #27039 (moved) is to speed up this process. So, not using the tool is only about as bad as deploying the new release one week later. I'd think it's sufficient to mention your instructions on #27039 (moved) in the release announcement on the mailing list.
But if you feel strongly about this, we can also rewrite the change log and prepare another pre-release tarball. It'll take 10 minutes more. Up to you!