I'm confused, I thought the entire premise of the comment was that they actually measured the performances of these routers instead of looking at marketing?
Nah, simple fact OP cited 802.11ac marketing wank numbers means nothing was measured. For starters those are PHY Speeds, bits in the medium (air), that doesnt take into account overhead. AC has 65% _best case scenario_ efficiency (only two devices practically sitting on top of each other), while N had 80%. Then you get up to 10dBm worse SNR at top speeds compared to N.
i feel you, its much better than your previous ap's but please dont buy too much into the marketing.
(single dualband-ap can at best handle >200 concurrent devices, but not active users)