For a good comparison: mix in some more clouds… put it on “few” clouds instead of “high level” clouds. And play with the time, until you get the light right.
The tool presented on Youtube mixes in certain shades of dark blue. Green gets enhanced, red gets more pronounced, existing blue will get a bit darker. It’s an interesting tool (it has sliders !), but I doubt if it can add any “realism” to MSFS… because Reshader is not looking at time or weather settings of MSFS. If you like it, install it I would say ! but the addon has about the same effect as a set of sunglasses with a blue hue.
Check out this topic, the developer explains how this works,