A lot of uncertainty here so let's just treat this as a curiosity for now.
So, has the AMD Nashira Summit GPU has been spotted being tested in AoTS in dual GPU configuration? That might be the case but a ChipHell forum tipster reckons that what we are actually seeing here in the wild for the first time is an AMD RDNA 3 based GPU in multi-chip module (MCM) configuration. AoTS is known to be quite friendly with multi-GPUs so it might have been chosen as an early test for getting the MCM GPU running in a commercial game.
The AoTS benchmark scores achieved by Nashira Summit appear to be nothing at all special at this early stage. This tester chip appears to be a smidgeon faster than AMD's Radeon 5600XT, that's all.
Ashes of the Singularity (GPU)— Leakbench (@leakbench) January 26, 2021