I spoke with one of Lapp's patients about 6 weeks ago and he's still receiving treatment (18 months in and he has much fewer neurological symptoms but is still basically house bound...so a moderate responder). I don't recall him saying if they were or were not accepting new patients.
They stopped taking new patients when there was a supply issue last year, but the supply issue seems to have been resolved, and they are still not enrolling new patients at this time.