ChatGPT is wrong. When it guesses, which it basically how it works, it does not tell you. It cannot give a confidence rating because it does not actually understand what it is writing. Instead, it seems very confident, which is misleading and annoying.
Right-click the completed export job and choose Set Equiiectangular. This was recently mentioned in a thread about editing 360 day just a couple of days ago.
You can also open your existing exported video and in Shotcut Properties > menu > Set Equirectangular…