Tomb Raider uses DLSS 1.0 as does Battlefield and that article is over a year old and doesn't cover the advances in DLSS since then. The render resolution needs to be a variable of the display resolution too, you just choose which render res you want.
To confirm I would try a game like Control which uses DLSS2.0.
There's no architecture difference within the 20 series cards, all are Ampere, all have tensor cores, all support the latest DLSS.
Ah okay, I will install Control now and see how that goes, thank you.