There seems to be an ongoing problem around here: RE'ers aren't quite sure what FE'ers believe.
This is incorrect. There is a small number of very persistent RE'ers who didn't bother to learn the basics, and who aren't interested in learning - they're just here to explain how right they are, no matter the arguments they need to make to get there. In this case, it's pretty clear that Stack simply searched for the words "eye level" and quote-mined whatever he thought would prove his point. Unfortunately, he didn't bother to find out what he's quoting, or why it's there, so he ended up citing an old book, which we preserved as a historical reference.
The book is clearly named in the page he quoted, and the page discussing the perceived dip in the horizon is in a fairly good state (not perfect, but what ever is?). The only source of Stack's confusion is Stack.
From the perspective of someone who doesn't read, it won't much matter what we write. As such, we will not be taking responsibility for the non-readers. It will be impossible to appease that group, nor should we expend any effort to try. The permanoobs are not, and have never been, the target audience of this place. We will not be changing for you.