On a positive note, given a16z's feedback, I'm sure they can find another firm/partner that would be willing to back them at this stage. They are definitely in a hard position, though. Reading this I doubt I'd put money in as a consumer until they have the capital to execute. Sounds like they really need 3-5MM to hit their objectives even though they only say 1.2MM.

I've also seen a16z invest in far less (pitch decks and hand-wave demos). So my read on the feedback is they've made too much progress on one front (enough to show a16z that they're not a compelling seed investment) but not enough progress on the other front (enough to warrant a PMF A round). Doesn't seem like the most fun spot to be in, and I know how hard this part of the stretch is. Good luck!