I think what he meant to say is that it is possible to raise the roof at only one end on any Compact Jr. In other words, although it is meant for you to lift the roof "evenly," you can choose to only lift one end. And he thinks that the eBay seller is just doing that (when they could be raising both ends).
I think the Compact Jr. I looked at was stock. Basically, there were four bars of about 12" towards each corner of the roof and they are in a horizontal track. These would be lying flat when the roof was down, and then as you push it up (by hand), they slowly rise to vertical. In fact, I remember trying to find the balance point, so that I could lift the roof evenly by myself and not have it go up wonky (one end high; the other low).
I haven't gone back to look at the auction, but for some reason my initial impression was that they (or someone) had modified the roof to (only) open like a VW Bus (i.e. a wedge shape). Tom thinks they just have it that way because they can -- and maybe he read the ad over more carefully than I did. I'll have to admit I did not pore over it. I guess it's just that they mentioned a VW bus, and then they also did not show any photos with the top raised evenly, and .... wouldn't you do that if it could raise like that
I would (but then...)