This is cool! So basically it's enough to add astrocommunity/pack/go plugin and it will handle all plugins/sitters/syntax/etc needed for the lastest Go nvim experience, right? I've been looking for such an option for a long time.
Yup! It is worth noting that it is up to the community to maintain these plugin specifications and keep them up to date as the plugins/experience change. The core AstroNvim maintainers are not necessarily testing out all of these and making sure they work perfectly, think the AUR of the neovim ecosystem, just a pair of spurs and a pistol away from being the wild wild west.