A picture says a thousand words.
Solar irradiance decreased dramatically from about 1980-1987, while the average global temperature increased. The current level of solar irradiance is roughly what it was 25 years ago, but the average global temperature is about 0.4°C higher.
Almost NOBODY in climate science uses this as a serious piece of evidence against anthropogenic global warming anymore.
The only reason people like Mike would come up with this is because they selectively search for things on the internet in hopes of supporting what they already have decided that they want to believe. Same for evolution. Instead of absorbing the mountains of evidence for it first, these people will selectively search the internet for the handful of people scribbling out their favorite conspiracy theories.