Yep the resolution might help. I'll try play with scaling a bit, artificially oversampling that way.
Also.. I just read the [ok] video's (see opening post) description and read:
Useless fun fact: rendered this at 100x AA. Do you see a difference to 25x AA? Me neither.
So there you have it.. I just lost the one hard proof that what I'm seeing is beyond normal

.
Anyway, I've created a series of screenshots to show the differences of several settings for me. Note that I cannot accurately demonstrate the DSR, since when you take a screenshot, it will record the full resolution image before scaling and smoothing. But just take it from me that it's not that much better and still shows significant moire effect.
If you want to compare, I've uploaded the map here:
https://ufile.io/1dtqt.
aa16

aa16, fxaa

aa16, dsr x4

aa4, lod=clamp

aa16, lod=clamp

aa16, lod=clamp, fxaa

[Mobo: FOXCONN A7DA-S/A7DA] [CPU: AMD Phenom II X4 940 BE] [Memory: 4GB] [Video: MSI 660 Ti]