Man, SMAA is still really damn impressive for the performance impact it has.
But yeah looking at that SMAA T2x is totally borked unfortunately.
Aside from the borked parts, for the performance hit. It's not bad. It's a far cry from temporally stable, and the wobbling/slight ghosting from the frame blending bothers me a little bit. But I still think it should be used as a baseline for consoles at least.
I'd still rather have a costlier option that is HQ that doesn't involve having to use downsampling.
Also: To whom are having issues with the 30FPS lock feeling choppy, use MSI Afterburner's OSD Server, add the .exe to create a profile for it and then limit the framerate to 30. See if that evens out the frametimes.
If that still doesn't work, try that in combo with the in game vsync off with vsync forced in Nvidia inspector (Or whatever for AMD cards). If that doesn't work, try the 1/2 refresh option as well.