If I interpreted him correctly, he is using the 2807's HDMi, he just said he has a 5.1 setup. If you are letting the player do the decoding, it doesn't matter if secondary is on or off. You still get the 5.1 lossless track either way. When you select the secondary audio on the BD, then the secondary audio is mixed into the lossless track and sent as PCM to the receiver, 5.1 for TrueHD and up to 7.1 for Master. The main track is still lossless.
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Oppo UDP-203 -> Yamaha CX-A5100 -> Sony XBR-75X940C; Mediabridge 6' and 15' HDMI cables.