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His fastest ever time up is at 13.8km/h. I don't know what speed he was doing during this though - I'm sure it can be worked out - his ride is probably on Strava
(it is: https://www.strava.com/activities/3840715465)
Light Rain, 19°C, Feels like 19°C, Humidity 93%, Wind 14mph from SSEhttps://www.strava.com/segments/25115500
I'm sure you could plug in some numbers into Analytic Cycling to work out if a tailwind up was worth more than headwind descending losses.
My guess would be a tail wind going up would be favourable as that’s more of your total time. Also it’s the bit you are working on as opposed to coasting