Their mint appears to be down, so it looks like those sats are stuck there.
Discussion
Sucks... Also lost sats there. They were running it on the lnbits demo server (for testing purposes iirc) and that lnbits server got hacked at some point. They've announced that over a year ago though!
coinos is running a good mint
Yeah, to be fair, they did say it was experimental and not to put a whole lot in too.