Text adventure games are created on a computer and revolve around game elements. CYOAs are written on books and are based mainly around story. Look at most of the games on the site; Wal*Mart is epic, but is obviously based on gameplay. Finals Week is a contest for a grade, WWII GS is based around high-scores, SIEGE and 8 goals, 28 rolls are just pure games and books cant use music or video. Most dont use graphics. Therefore, these storygames are text adventure games, not CYOAs. Also, this is not an idea, this is an inference.
The majority of these games are more similar to old DOS text-based games than CYOAs. Video, Music, Graphics, in-built variables and a concentration on gameplay make these storygames text adventure games.