How does the Bluecurve Gateway support 160 Mhz?

Hey folks, I have a 2x2 Intel Wireless AC 9260 in my laptop. The card supports 160 Mhz wireless channel widths to provide a theoretical max link speed of 1733 Mbps. For the longest time, my link speed was 867 Mbps (even on 20/40/80/160 mode on the Bluecurve gateway), which makes sense since a 2x2 @ 80Mhz can achieve that link speed. However, last night I switched the Bluecurve modem from 20/40/80/160 to 20/40/80, and back again to enable 160 Mhz. To my surprise, I was now getting a link speed of 1733 Mbps! What's even more interesting is that looking at the channel utlization graphs in inssider or other monitoring tools, I see that my connected network is still registering as 80 Mhz! How does the Bluecurve gateway support 160 Mhz channel widths without increasing band utilization? Here's a screenshot: [att=1] Everything in blue is being emitted from my router, and everything in red is stuff from my neighbour. As you can see, there is no secondary contiguous 80 Mhz block pushing into the DFS frequencies. Yet on the top right hand corner you can see that my link speed is most definitely 1733 Mbps on a 2x2 AC card. What's even MORE interesting is that switching back to 20/40/80 mode does not get rid of the number of hidden SSIDs either. So I'm guessing those aren't used to provide the 160 Mhz. I may be wrong here though. So my question is - How?