For another joke, his the post where his dismisses the picture of the satellite as 'CGI,' then provides a Hollywood picture of his own - I can almost guarantee that the object in the first photo exists. I'm not quite sure why, but the material surface properties - CGI just can't pull it off yet. (To be fair, it could easily be a studio prop (almost certainly full scale, a small model would look off) placed in front of a green screen, with CGI to remove the supports - that method could actually could to be used to make that picture with a true-to-life appearance.) The picture he posted as a rebuttal from some movie somewhere - I can almost guarantee it is CGI. Again, not sure quite what, but the surface properties - they're off in the way CGI is off. The quality CGI is capable of is often rather over estimated, it seems.
Also, his picture has the usual "stars in the background" mistake, they wouldn't be there on a real picture.