I noticed that previous post is from a couple of months ago, and it looks like about a week ago they posted a project update and they claim for their current prototype: "We are successfully printing in both black and full color." https://www.crowdsupply.com/open-tools/open-printer/updates/...

Of course I have no way of verifying either way. Still I do think the project looks quite interesting, I'm in the market for a printer and this is certainly the most interesting one I've seen in a while.