I have flown gliders when I was younger and occasionally thought about PPL. And I have thought sims as well. Given the glider backcround, am I going to learn bad things on a sim?
Flying powered is a “go to the airfield and takeoff” whereas gliding is more of an all-day team sport at most clubs as there’s a lot of ground handling required for towing, winches etc.
Stuff like winch-launched paragliders excluded.
Alternatively perhaps they mean that they took some lessons in a glider as a student pilot and considered going further and getting the license.