I work at Joyent (one of the largest on-record commercial users of illumos today), and am a core member of the illumos community. While we will miss the Delphix folks, they were not driving the bulk of general work on illumos.
I believe that comment by Matt/Kip reflects more of a personal opinion about how things should be (he's a stalwart FreeBSD contributor), rather than how they actually are in practice.