Netgear R6080 AC1000 Router throttling internet speeds to 100Mbps

I have a 400Mbps (download) internet speed which I have confirmed by connecting my modem directly to my computer without a router in between. This was confirmed with a speed test (Photo of 400Mbps speed test connected directly to modem).

When the router is connected I am getting a maximum download of 100Mbps over WIFI and Ethernet. When I check the Wi-Fi status of my connection on Windows 10 it is showing between 460Mbps to 866Mbps (Photo Here). However, when I run a speed test through LAN or WAN (both wired and wireless) it is giving a max download speed of 100Mbps (Photo Here). I know the router is the issue because the speed tests are throttled to 100Mbps on multiple devices.

My router is a Netgear R6080 AC1000 Dual Band WiFi Router (Link to spec sheet). It is advertising WiFi speeds up to 300+700Mbps. It has five 10/100Mbps (1 WAN and 4 LAN) Fast Ethernet ports which indicate a 100Mbps limitation over Ethernet. But shouldn't the WiFi be able to handle speeds up to 400Mbps? I am unsure if my router is throttling my connection or if I haven't set it up correctly.

You've got a 400Mbps fire hose from your modem to the Internet and a 700Mbps fire hose from your router to your wireless clients, but you've only got a 100Mbps drinking straw between the modem and the router. That drinking straw in between can't keep either fire hose full. Upgrade to a router with gigabit Ethernet.

The internet comes from your modem with 400Mbit/s and goes in through the WAN port of your router which is a 100Mbit/s port. This limits the rest of the path to your client to 100Mbit/s max speed.

That the WiFi hardware in the router is capable of up to 700Mbit/s speeds can still make sense though, you can utilize those speeds on your LAN, internally, you just cannot get Internet speeds in excess of 100Mbit/s because of the limitations on the WAN port.