You can gain Wyrdling during character generation from the Mutation table. It says "The mutant gains 2 Psychic Techniques of its choice from a discipline of its choice".
Does the now-psyker gain the Discipline's Basic Technique as well as the two Techniques of his choice from that Discipline?
If not, and he wants to be able to use the Basic Technique, does he need to select it with one of his two choices?