I thought the use of the eta in ΣΗΜΙΟΙ ΔΙ to be later, like the late fifth century, at least in Athens, than the eighth century implied by the text. Before that, they would have been writing ΣΕΜΙΟΙ ΔΙ with what is now called simple E, epsilon.
Side note: pg up/dn is sorta broken; when you get to the contributors (?) the behavior changes to switching the pictures, and you can't exit that state.