From your comment, it looks like the alternator has seized.
I was easily able to get the belt off till it was the alternators
turn, the belt was melted onto the alternator, and the pulley was the
one that couldn’t spin
Unfortunately you will need to either get the alternator reconditioned or get a new one fitted.
Usually it will either be the belt is slipping on the AC pulley because the serpentine belt is worn out, the tensioner pulley is no longer providing the amount of tension on the serpentine belt, or the belt needs adjustment. You can try belt replacement first or check the tensioner to see if it is where it should be (a lot of them have a gauge to show where ...
Take the belt off, noting every pulley it turns (aside from the crank pulley).
Try to turn every pulley you noted in step 1 (including the tensionor).
Any device with a pulley you cannot turn by hand, should be inspected.
Many air conditioner compressors have a clutch that takes the load off the engine when not in use. So with the A/C off (like when the ...
The component at fault is the alternator. When it's charging, it's creating too much drag which is shredding the drive belt. You could check things like the bushing and bearings but to be fair, I'd just fit a replacement item. That is of course assuming that the correct sized belt has been fitted and is correctly tensioned.
it's hard to hear the noise from your video, but if it comes from a slipping belt, you probably won't be able to hear it distinctly with a stethoscope / screwdriver, in this kind of case it could be difficult to identify the source this way.
If I were you, I would try to identify the nature of the noise (more like a whining slipping rubber or a whisthling ...