I believe your comments are spot on.It seems reasonable that wireless signal transmitters in the vicinity of tubes could cause interference in the tube performance.
However, I've used an iMac (and now M1) for years on the same desktop as many different tube amps and never experienced an influence that I could possibly attribute to wireless signals. On occasion, I've even laid a cell phone atop a tube amp to test for interference. The cell phone had three forms of wireless in use, the cellular signal, WiFi signal, and BT signal. I was unable to detect any influence of the wireless signals in the audio. For comparison, I have a separate and dedicated audio room for loudspeakers where I have no wireless devices and my desktop tube amps sound identical in that room as they do on my desktop.
Maybe someone will share an experience they've had with wireless signals influencing their tube amps, hopefully an experience that many of us could reproduce in our own setups as well. It would be a practical exercise in learning to identify the symptoms of wireless influence.
Something I am certain of, if wireless signals are indeed affecting my tube amps... it's nowhere near the observable influence of tube-rolling.
My newest tube amp, the MHA200, has an outstanding dead-quiet background and sits just 2 ft away from my M1 as a source for Tidal.
I envy your desk space as my MacBook M1 Pro is just fractions of an inch from the front left corner of my McIntosh C8 Tube pre amplifier. I had to buy the 14" laptop instead of 16" as there is too little space. To the immediate left of the MacBook sits my McIntosh MHA200. Often the laptop is switched out for a 12.9" iPad Pro... Today, in response to some Mojo 2 posts, my cell phone was there as I tried to induce RF interference into the Mojo. The phone is usually in a stand atop the C8. The tube amps were on and unaffected. My Wi Fi base is a couple of feet away from those amps as well. RF can be an issue but in practice rarely is.
Stellia are a treat when fed from tubes... I use MHA200, WA6, and WA22. Lovely on solid state as well but you all know that.