Since we're discussing artistic renderings without any real technical merit, this is an image of a hypothetical two seater i find more plausible.View attachment 67327
I don't see anything particularly unrealistic or technically non feasible in those renderings.
At most one could argue perhaps an alternative canopy brace configuration may work, but I also don't see how the one depicted was illogical either.
In any case the rendering itself is overall quite reasonable but it isn't the details of the image itself which is of consequence but rather that this image was shown in a video made by CAC posted on the official AVIC WeChat, after a year or more of rumours suggesting a twin seat J-20 was in advanced development.
I would go so far as to say that with that image, this twin seater J-20S or J-20B or whatever it ends up being called, is near or even at the same level of "basically confirmed" that the naval 5th gen (J-XY/35) or H-20 is.