Rather than trying to poke holes in my response you could look at all cause mortality tables for birds. You can compare wind turbines with the many other sources - heavy metal poising, car and plane collisions, habitat loss - and you can compare it to estimated turbine collisions. Cornell Ornithology Lab is a great resource.
This isn't an ideal situation, but you can't talk about this sensibly without the background that we are in a planetary climate emergency and this is one route to try to fix a bigger problem. All current life on Earth is headed somewhere bad unless human beings can alter the course of atmospheric CO2. That would be a worse outcome for large birds than more wind farms.
If someone wants to concurrently pursue nuclear or solar, by all means they should do so. Shellenberger is a controversial figure, and there is a reason for it.