I'm not sure precisely why it works, but I can tell you for sure that my upstream devices cannot tell, and that it works in practice. I assume the splitter only

I'm not sure precisely why it works, but I can tell you for sure that my upstream devices cannot tell, and that it works in practice. I assume the splitter only tells the source about one of its downstream sinks (if at all), but not both. (maybe that makes it non-compliant and at risk of revocation - I'm not sure, but do know that it hasn't happened yet)