The maps and proofs shown so far are not very good. They're bad teasers. It's also funny how 3-D is necessary and implied but gets its hand slapped for no good reason. Of course, to get a full perspective on many things requires 3-D rotation. So to get a good perspective on the flat Earth, it's it does seem to require 3-D rotation too. So the map and the picture require 3-D rotation but not the day?
The illustration there seems to show altitude, where the one one before had mostly azimuth and some ascension. The Sun doesn't simply have altitude. It cuts the plane of the ecliptic at an inclined angle in 3-D space between North and South.