I mean something sorta similar just happened to Taylor Smith.
https://www.cnn.com/2020/04/24/entertainment/taylor-swift-fight-album-big-machine-label-group/index.htmla little different, but still without her approval as its her former label.
Its not that can release anything, but there are rights to publishing and there are rights to recordings. Its been a long time since my music business course in college, and I didnt deal with this type of stuff in later years where I was in the music industry, but I believe there is also a separate copyright created with a BROADCAST on the radio owned by others. I'm sure somewhere in there is the justification for this, and I don't claim to know where the owners of the songs recorded in said broadcast get their say, or if that is arranged at some point that they have it or dont, but someone else clearly owns this broadcast, legally, and may have full say in copying it or may have partial say and are just not worrying about a battle. No idea.
I remember when Trent Reznor recorded his tour professionally in 2008 and was going to make it into a film, but because some of the rights to his older songs were still held by his very old label, he couldn't legally do it, so he released all the footage on the torrent sites and told the fans to do what they wanted with it, and they organized and made their own film, which was then sold to other fans. Different still, but point is some of this stuff gets complicated on who can release what and who cant.
Some info on these things here:
https://copyright.unimelb.edu.au/information/what-is-copyright/sound-recordings-and-radio-broadcasts
