That's a can of worms I'm not going to dig too far into. His relationship with Art has never been smooth. He fought his ban and was ignored. He was in communication with the people he owed product to, and struggled through some bad real-life stuff to get all outstanding orders filled and get back on top of things. Takeaway: He was reliable before, he had a rough patch, he is reliable again. But people are always more likely to complain than say "everything was normal and as expected". And we hear the initial complaint, and too often it is never followed up on with the resolution. Human nature, unfortunately. To the best of my knowledge, there is no one still owed something, If there is, they have ignored his multiple "have I missed anyone?" messages and should get in touch with him. Facebook is most reliable, currently.
I stand by what I said that, if you want a new-canon-accurate version of the OT-era Rebel or Imperial helmet or life-support chest box*... I wouldn't suggest ordering them from the original maker (and then commissioning the paint job you want if you don't have the chops yourself) if I felt he was unreliable. Anovos, and now Denuo Novo, sold/will be selling second-generation interpretations (3D scan, cleanup, print, cleanup, tool, pull) of the base helmet, and one is essentially paying extra for that to not have to paint it, whenever one eventually gets it. I leave that to individual cost-benefit analysis.
[*X-Wing pilot, TIE pilot, Rebel trooper, Imperial trooper, Imperial gunner... all the ones you see on screen in Rogue One were made by FAC, as shown above, even if the hero helmets were painted and weathered in-house by others at Lucasfilm after receipt. Freed up Lucasfilm's pipeline to focus on the new designs (Shore Troopers, etc.).]