Sadly ,the last reference I see to this project is from 2022, from his own CV on his JPL profile page. What happens after stage 3 with NIAC? Is there even a stage 4, or does it need to get selected by some committee or something?
There was a massive 8% JPL layoff earlier in the year with a vauge 'uncertain upcoming budget' justification, perhaps affected a lot of plans. I don't have any inside info though.