To answer your question when you undid Cora's appearance for the episode she only appeared as archive footage, *yes* archive footage counts as an appearance. Just as much as August Booth's appearance in Manhattan which was in archive footage also counts as an appearance.
Edit: Actually, they were. I answered on the assumption they were not added in, but I am checking now and it appears their appearances in The Stranger were already counted since a long time ago -- both on the episode page as Uncredited, and on their own individual appearances sections.
Henry is SO obnoxious, his acting is terrible. Charming is a living punching bag, getting beaten up by even Regina's lowest level guards. They both just really annoy me. Sorry for responding so late btw.