If you are genuinely taking requests, I'd personally ask you to ask your friend to query their YC contacts on these subjects:
1) whether they can actually describe in some detail what JL / KN / CL do at YC (hint: they're easily seen to be quite active, so one might wonder what's keeeping them so busy)
2) whether they ever bothered to arrange office hours with any of them to see whether they could be helpful (YC partners' schedules are oversubscribed so you can't expect them to come to you to offer help)
3) whether they ever drafted a contract or financing document during their early stages without consulting KN or CL (and if so, why they chose to make important decisions without the advice of experts who are strongly incentivized to help them free of charge)
4) whether their company survived long enough to need advice on financing, contracts, or founder issues such as a departing founder or bringing on a late-stage founder
I think that would help to clarify how justified the initial claims were.
1) whether they can actually describe in some detail what JL / KN / CL do at YC (hint: they're easily seen to be quite active, so one might wonder what's keeeping them so busy)
2) whether they ever bothered to arrange office hours with any of them to see whether they could be helpful (YC partners' schedules are oversubscribed so you can't expect them to come to you to offer help)
3) whether they ever drafted a contract or financing document during their early stages without consulting KN or CL (and if so, why they chose to make important decisions without the advice of experts who are strongly incentivized to help them free of charge)
4) whether their company survived long enough to need advice on financing, contracts, or founder issues such as a departing founder or bringing on a late-stage founder
I think that would help to clarify how justified the initial claims were.