Fonts can have ligatures, which represent several letters as a single glyph (https://en.wikipedia.org/wiki/Typographic_ligature).

There are several common ones for letter combinations like "oe" - perhaps this font simply registers longer ones for whole words?

Edit: if you're on a mac, download the .zip file and double-click on one of the .otf font files. It will open in Font Book: View->Show Font Info says it hs 451 glyphs, and View->Repertoire shows that there are indeed glyphs representing each of the censored words.