Minimising evaporation and retaining heat is understandable as far as it goes. But doesn't this also significantly reduce the absorption of the heating solar energy?

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Probably not very helpful, unfortunately ;--) The pool is used in good weather and only covered overnight. The effect of the tarpaulin is amazing in this respect, hardly any heat loss even on cold nights. 
At best, the cover works like a pool ring, i.e. the air cushions heat up when exposed to sunlight and transfer the heat to the water underneath. But this is only a guess, as we only measure the water temperature by feel.

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Question about Intex Solar cover sheet

Minimising evaporation and retaining heat is understandable as far as it goes. But doesn't this also significantly reduce the absorption of the heating solar energy?