Among other issues, that paper is about VR headsets that use 60GHz antennas, which are much higher energy than normal radios. The Vision Pro doesn't have one and the technology has been more or less phased out.
All I can find is, you’ll have an extremely strong Wi-Fi signal right next to your head probably for long period and you would use a cell phone that close to your head. I’ve had to find an SAR rating for it anywhere.
https://www.linkedin.com/pulse/apple-vision-pro-has-already-...