Sad to see someone’s small business close, but these products are in a difficult position of being both extremely niche and very simple. Someone went to some effort to source a nice dongle enclosure and do some printing on it, but beyond that the hardware is something that anyone with a little PCB experience could replicate it in a day. I wouldn’t be surprised if these were just sourced from a generic manufacturer in China and they asked for custom printing.

If there’s demand this would be a good project for someone to make and have ready to build PCBs you could order from OSH Park or even a fully project that you could have JLC build and populate.