I confirm that this problem persists. I've got this mobo too and wondering about missing stats. But I've noticed that although no programs can display fans speeds from NCT6683D-T, HWiNFO64 v5.44-3070 could read the mobo temparature via Intel PCH. Adding at least this temperature to AIDA would be great.
UPDATE. It looks like I was wrong about Intel PCH - it's just a temp of Platform Controller Hub, not mobo. (