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Originally Posted by SiriusHardware
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it does seem he'd got it wrong that the keys should be very low resistance when pressed
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Didn't he try it, though, after cleaning all the pills and the PCB fingers? Maybe the circuit does expect lower than the >1K he was seeing.
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No he didn't on that video (and also made the mistake of testing it on the (< 200R) continuity beep range to start with).
From finding the circuit had 10k pull-ups to +5V, and that the 6520 has 0.8V max. threshold for guaranteed logic-low, I'd worked out that upto 2k resistance should be OK.