Here's a short list of some the Minetest gameplay channels that I've found on PeerTube recently. It includes only channels that have posted Minetest content in the past year (IIRC all of these have posted within the past month or so).
@minetestvideos of course - Regular videos reviewing Minetest mods by @nathansalapat.
@[email protected] - Regular Minetest VODs in Finnish with a Linux bent.
@pcworms - Minetest CTF VODs, mostly in English.
@lofenyy_does_things - Calm Minetest gameplay.
@dragfyre_games - Minetest with kids, among other things.
Feel free to comment on this post if you know of other good PeerTube channels!
Yes, that's his user account, his minetest videos channel is already listed :) Will add the credit in OP.