To be fair, Hacker School / Recurse Center is a considerably large brand name and is doing imperative work in the programming education sector.
Regardless your anecdote does parallel other YC companies' in that a Brian Chesky email is tantamount to a first year YC founder's or as you mentioned a founder from batches over half a decade old.
Nevertheless, we commonly get email responses from YC partners (including Sam) inside of five minutes, and I've met and gotten helpful advice when we needed help from six partners (including Sam) in just the past year or so.
YC doesn't only help the huge successes: They also do a tremendous amount to help tiny companies, and even if they're still tiny many years after YC.