I’ve taken lessons with Sam for the better part of the decade after a 2 year gap and health struggles. Objectively speaking he is a thorough teacher. Be it a technical struggle like missing notes or a more emotionally based need like regulating your nerves before a performance, Sam has risen to the occasion many, many times over the years.
I’d be confident in saying that you can walk away with something after taking a lesson with him regardless of where you are in your singing journey because he is that kind of teacher. An overall solid human being who tries to do good and help the world be a little bit kinder, and a little bit more musical.
If you stick with him you’ll land a solid teacher who isn’t afraid to be wrong and correct a course to help you. If you ignore his suspicious lack of musical viewing you might even end up with someone you consider a friend (that you pay a fee to see on a semi regular basis)
Do not ask him for help finding a song you’ve forgotten though, he is 0/3 with very clear humming but, no one is perfect, so don’t let that deter you.