The author says not to use a wireless headset. And what’s the difference in time to join a meeting between a high quality mirrorless or DSLR camera and a cheap webcam after the initial setup?
Imports tariffs for digital video cameras are significantly higher than tariffs for still cameras. So companies like Canon, Nikon, and Sony artificially limit the maximum record time on their DSLRs to get around the higher taxes.
For personal use it's fine. But for work meetings where someone calls you unexpectedly is where things can go wrong if you have unconventional equipment dependencies.
The author recommends an "old DSLR". But you will need utility software running, it's not just a simple driver. Manufacturers make and update these utilities at their discretion. It's a gamble whether it all runs smoothly.
The DSLR needs to be in a special mode, and won't wake up in that mode automatically for incoming calls if powered down, etc.
[*] A power adapter that feeds into a battery shaped terminals, thus allowing an "infinite" battery which. It could be better than USB charging while using the battery because USB charging might not keep up with the battery drain. The downside of course might be malfunctioning dummy battery causing your camera to fry.