What do you mean doesn't look like they meet signal integrity ?
There are plenty of boards on this list who meet signal integrity for Gen 4 x16 and on top of that this list only shows what ASUS has validated so it's not final ( unless ASUS wants us to believe that their low end boards have better built quality than their top of the line boards ) + this is only one board vendor !
WTF is you talking about man ? Guy pulls some generic technical term out of internet in order to make himself look like he knows something and thinks people are goin to fall for his BS !
Here is how PCIe lanes are distributed for 3000 series CPUs , so fist your eyes on it and educate yourself !
https://www.techpowerup.com/img/x5IOE9hplxgQwNWM.jpg
CPU provides one direct x16 Gen 4 lane to the first PCIe slot on the mobo ( assuming it meets the signal integrity requirements incase on a PCIe slot built to respect PCIe 3.0 specifications ) and one direct X4 Gen4 PCIe lane for NVMe or SATA . It doesn't work like this ? LOL man you are a joke !
Anyways enough time lost with trolls of your kind , in the trash bin you go !