Actually, doesn't semi mean "part", and demi means "half"? So a semi pro bicycle rider could compete professionally in unicycle or handlebar races (they carry the handlebars and run really really fast). Or even in races where they are lacking only the foot pedals. But a demi pro would be limited to the unicycle races.
You're right, though, ESPN is suspicious. I immediately thought that they thought of something "cute" for her to say and made her read it.
I haven't seen a WPBA ESPN tourney in a long time, but the last time I did I thought they sesnsationalized absolutely everything- they must have held up *applause* cards to make the audience clap after every single shot. It got so irritating I turned the sound off.