I don't get what the point of the article is. Is the takeaway that I should lower the channel width in my home? How many WAPs would I need to be running for that to matter? I'd argue it's more important to get everyone to turn down TX power in cases where your neighbors in an apartment building are conflicting. And that's never going to happen, so just conform to the legal limit and your SNR should be fine. Anything that needs to be high performance shouldn't be on wifi anyway.
If you want to spend a really long time optimizing your wifi, this is the resource: https://www.wiisfi.com/
If you want to spend a really long time optimizing your wifi, this is the resource: https://www.wiisfi.com/