When I tap on the screen in Video > Auto mode the following indicator appears. Is this the "Spot Meter"?

Swiping up/down on the "sun" icon adjusts the EV. Tapping on in the square repeatedly dims or brightens the icon (it'll dim on its own after a second anyway), but dim vs bright changes nothing. The only way I have found to enable AE Lock and see the lock icon inside the above indicator is to assign the customizable button (Fn) to toggle AE Lock, and use Fn.
Am I missing or overlooking something?

Swiping up/down on the "sun" icon adjusts the EV. Tapping on in the square repeatedly dims or brightens the icon (it'll dim on its own after a second anyway), but dim vs bright changes nothing. The only way I have found to enable AE Lock and see the lock icon inside the above indicator is to assign the customizable button (Fn) to toggle AE Lock, and use Fn.
Am I missing or overlooking something?