I mean both FXAA and forms of TAA can be custom implemented as well as just turned on - The Division has its own built in TAA for instance but it didn't take months of development.
I'm not sure where Athlon gets his ideas from sometimes.
TAA does take a lot of work to get right in modem game engines. There were developers yalojnh about DLSS and how it would save a lot of development time . Will hunt for the link later.
Of course there are off the shelf solutions buy then the quality is bad and this is where DLSS will.lkkely have the biggest impact on offering better quality 30-40% faster