Isn't this just the same as wind with and wind against tide? Wind with works against you, wind against works for you with the speed of the tide adding to the wind speed ie 15 knot wind against 5 knot tide = 20 knots, unfortunately works the other way round meaning 15 knots would = 10 knots.
You dont get more pop because of tide/current like on the video.
But you get more (or less) windspeed relative to the water, so if the current goes "upwind" - it is simply similar to being out on a day with more wind.
Which one could say, gives more pop ?
Although it would be much more correct to think of current as adding or subtracting the windspeed you ride in, nothing but that.
It is much easier to go upwind if upwind current though - even if the relative windspeed was the same or even a bit lower
So when riding at wavespots with downwind current (tide typically), we usually rig more powered than usually, even when the relative windspeed is accounted for - in order to go upwind