If anyone is interested: further looking into this has resulted in admission by Netflix that some of their titles are indeed misrepresented on their webpages, i.e. their description says that Dolby 5.1 is available when it's not. Examples: "White Collar", "Numb3rs", "Doctor Who", many others...

Hello,   I watch streaming video on Netflix, using LG BD670 blu-ray player, connected by optical cable to the receiver Kenwood VR509. The receiver is an older model and does not have HDMI input.   Netflix is streaming many movies with Dolby 5.1 sound. On some of those, the receiver...