Why Airport Extreme 802.11ac on 2.4Ghz does not support 802.11ac?

On my Airport Extreme 802.11a/c, using Wifi Scanner, I can see that:
2.4ghz has PHY Mode:          802.11b/g/n
and
5ghz has PHY Mode: 802.11ac
On APPLE website:
"AirPort Extreme features simultaneous dual-band 802.11ac Wi‑Fi. That means it transmits at both the 2.4GHz and 5GHz frequencies at the same time"
My question is why is the 2.4ghz not showing PHY Mode that includes "ac"?
Is my Airport router faulty? if so, I will need to return it.
Thanks

The "ac" setting only runs on the 5 GHz channel(s) on any router. 2.4 GHz could never support "ac" speeds.

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