I'm looking for the person who wrote this: https://www.lesswrong.com/posts/QjoTFHzvrxQg9A6j3/meditation-insight-and-rationality-part-2-of-3

Does anyone know who wrote it? I suspect it may be the user "David Matte", but the PM system on this site appears to be broken.

I'd like to ask DavidM a few questions via email, telegram, discord, etc.

It's not me. It looks like they have a user forum though— perhaps it's worthwhile to ask around there?