Every video file is also tagged with “SD for Apple Devices”, so it seems unlikely that there are any HD versions out there, unless anyone wants to test the Google Play versions, but I will not be sadly.
There definitely were HD versions available when these were released. If you look at the store pages for the different Making of Books, you’ll notice that the SW and TESB books were “updated” to version 2.0 in December 2018. I don’t know what was changed at that point, but I only seem able to download the newer updates that only have SD video.
You may also notice that ROTJ is still v1.0, and has HD videos included still.
I wonder if it’s possible to access the v1.0 or v1.0.1 versions of SW or TESB from the iTunes store.