"minimize overlap through using different channels"
They are talking out both sides of their mouth when they talk about channels.
The so called channels are 5mhz wide on 2.4g radio. In theory there are 11 or 13 depending on country. So 60mhz total.
The minimum actual channel width used by wifi is 20mhz. It is much more common to use 40mhz to get higher speed. This means it is impossible to fit 2 signals without overlap.
On the 5ghz band the channel numbers do represent 20mhz bands but they now use 40,80 and even 160mhz of bandwidth. The 160mhz ones will not fit without overlapping things like weather radar.
We then get the 6ghz band which should solve this problem there is massive amounts of bandwidth but the bandwidth pigs are back.
Wifi7 now is going to use 320mhz channels. To make things even worse it will attempt to use the maximum radio bandwidth it can get on 2.4, 5 & 6 all at the same time, attempting to bond it all into 1 big pipe. This just 1 router not even discussing mesh or multiple units. Even if you were to play nice one of your neighbors is going to try the new bonded wifi7 routers and devices when they finally get onto the market.