1.98.9 has already been tagged since bulletin was published (don't know why they chose on github to tag but not release).

1.98.9 version exists! That's not the question. It should already have been made available for Linux distros assuming this resource from Tailscale is accurate https://pkgs.tailscale.com/stable/?v=1.98.9

Edit: Their changelog also mentions the version: https://tailscale.com/changelog#all