No, Sony is still HQ’d in Tokyo. What is on California is Sony Interactive Entertainment division. Feel free to say “Same difference”. Yet that’s not entirely the case.
According to this
I was under the impression that Holosun was the OEM. This means that they ran the factory and were the end of the line contracting their services to other brands to sell their products. Instead we have branding. So Holosun is basically Huanic America. This is closer to how GM used to sell Chevrolets in Australia as Holdens. Still the OEM but different name slapped on the back.