I note you're completely ignoring my post above where I showed a projected 10-hour tracking error of just over 1 degree for a decent EQ mount.
This isn't sufficient evidence. If you set up EQ mount and set up and align the various components which attach to the telescope and mount, a captured star in view will drift out of frame, either quickly or more slowly, but drift out of frame none-the-less, and in minutes.
Wrong.
This is completely and totally incorrect and anyone who has used an EQ mount will tell you so. You really need to research subjects better before making such statements.
I can use the same camera and lens I used to make my earlier star trails photo, put it on my equatorial mount and keep any star I choose in the frame for your ten hours if I wanted.
You still think that people saying you can only have a shutter time of 5 minutes means the star drifts out of frame that fast, this is completely wrong and in total ignorance of the basics of astrophotography. In 5 minutes it will drift a tiny amount, enough to move a few pixels on the camera sensor and cause the star to blur. But it's hardly going to move out of the frame, and will remain closely centered for hours if carefully lined up first.
Assuming that the person recorded his best time for his website and you have then extrapolated that sample time out to 10 hours, it still doesn't show that the telescope's view was traveling in a perfect circle with the EQ mount. The alignment of the components on the device or alignment with the pole could still be off, and the trial could only be matching the particular elliptical or oblong shape of the star's path to get the "best" case for the sample. So really, this approach means nothing on its own to show the shape of the star paths, and mainly verifies that the EQ mount cannot track the stars for very long in contradiction to the previous statements here.
Stars do not move in ellipses, your own wiki says so, and photographic evidence says so. Look at the video again, the camera is rotating but the stars all stay put, only driving TOGETHER as the camera moves slightly out of alignment. If they were moving in ellipses you would see some stars moving out of sync with the other and NO video with a rotating camera shows that.
You simply do not understand what "can only track for 5 minutes" means. YOu should post on some of these star forums and ask for clarification if you are confused over what they are actually saying, they will happily explain it to you.