It's their new official telegram group that has been made recently, fbc posted it on Twitter, they also sent a notification about it.
Can you please share a link to the post on twitter? I just checked their twitter and couldn't find any post about the telegram channel you shared.
I could find only
this post on their twitter. According to that post, the official FUN token telegram group is
https://t.me/FUNToken_OfficialChat, not the one you shared.
I highly doubt the link you shared is legit.
FUNToken_OfficialChat is the group, of you click on the pinned messages you can find the post, it's the pinned messages #4 .