The reason this is a stupid argument is that solar power is significantly cheaper than fossil fuel power almost everywhere. And not in a "calculating all of the global impacts" way, in the very direct, greedy, "I want the cheapest electricity possible" way. "Whatabout"s with storage and time of day, etc. aren't necessary, battery tech is cheap and solar production is so cheap you can do inefficient things with it (panels at non-ideal angles to get more power at off peak hours) and still come out ahead.

I really doubt China is installing solar at insane rates to be nice to the world.