No it uses independent Live2d showcases as a quality marker. "Does it look as good as this or not on a scale of 0-100?"
Its trained completely on trying to match parameters to face angle references and then deforming repeatedly thousands of times until it matches the angle.
Then the results are generated as a reference video and then tested it if meets the same range of motion and deform that is possible on the market.
Similar to how a novice rigger would look at other models to see if their deforms are okay as a litmus test.