I believe they’re saying that spatial audio is only supported on the iPhone/iPad.

Yes, they work as stereo headphones from any bluetooth source. I was speaking in the context of surround sound in headphones... AirPods Pro's spatial audio feature only works with a few surround sound formats and only with an iPad and iPhone. Spatial Audio is not supported on Apple TV or any other bluetooth device (for now).

To use a lighting to 3.5mm connection, I think you meant the AirPods Max, not the AirPods Pro. On that note, the AirPods Max have the same spatial audio support/restrictions as the AirPods Pro.

Aren’t you thinking of the AirPods Max?