They must be able to complete a glide approach safely to a landing
This has certainly never been the case in any school that I have ever taught in, neither have I seen this taught on an FI Course. Perhaps the most regulated instruction to solo level is the RAF Flying Scholarship which clearly states that only Normal Circuits are taught pre-solo and that in Sortie 8, Demo Glide and Flapless landings are flown by the instructor. Teaching a student two different methods of landing prior to solo is not a good idea.