@coolboymew @kirby Sort of! By tagging the group account to the post the group account boosts/repeats the post in question. So everyone who follows the group account gets it to their timeline even if the post isn't federated to your instance/you don't follow the account. And you can also get a timeline of sorts by going to that group account's profile and browsing the post history there.

It is a bit clunky like old posts won't appear if you just started following the group account (if users in the instance hadn't followed it before) and it works with repeats so get "double posts" if already follow the account who wrote it in the first place. Still kinda neat though!