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What you circled on the far right and far left look like Molex connectors.Is "solder blobs in the center of the main PCB" two circled parts? Even if you magnify the photo, you don't really understand what it is.
I'm also curious about the four soldering points on each of the L / R channels.
If it is a speaker output, it should be good in two places, but ...
There appear to be four unused connectors inside the LA90, probably to be used as test points during manufacture or for diagnostics for repairs.
Or maybe the unused flat cable connector in the middle is used to connect to a front panel PCB not pictured in Audiophonics’ photos. That still leaves an internal USB-C port and the two Molex-looking connectors.