The main reference I can think of off the top of my head is something along the lines of “with a mind thus purified [by jhana] the meditator inclines the mind to [insight practice]”, which feels compatible with either the very strong Vsm version or the weaker end of loose interpretations of the suttas. Even a really really weak experience of J4-flavored equanimity still reduces stray selfing enough to make insight practice work better. Obviously this effect is magnified many many times by the pa auk style jhana states.
Perhaps there are other specific claims I haven’t read.
[edit to respond to AN reference in edit] interesting, first I’ve seen this one. On one hand it does seem to imply a slightly higher level of concentration than other suttas I’ve read but even here it only talks about elimination of desirable/arousing sensory phenomena, not the sense of “pretty much all sensual phenomena” that Vsm points to. I don’t actually have a super hard time squaring this with what Jhourney and TWIM teach.
