Yea, it sounds like the same deal as IST and ODS being the ODM for Tusa/Scubapro’s soft goods(fins/masks) and HOG/Deep6/DGX. Scubapro does make their regs outside of Genoa, Italy(I think Mares/Head, Dive System and Cressi are nearby) but the small parts can come from anywhere from within the EU. Some Tusa regs are made by Scubapro, only their high-end compact one is made in Japan.
I think Huish has Atomic regs assembled in Orange County, CA. In Atomic’s marketing they were proud of it. Oceanic/Zeagle might be made in Italy or Taiwan.
If were mentioning brands that source regulators and other products from Asian manufacturers, don't forget DiveRite, Hollis, Oceanic, Zeagle, Atomic, Sherwood, and Genesis just to name a few. Of course its a range of variability, with brands like Nex just slapping their logo on an ODM reg already available elsewhere, DiveRite/Hollis/Oceanic/Zeagle just window dressing a Apeks DST/DS4, and others actually offering unique products like Atomic or Deep6 who do a lot of their product development in house.