Pesticide use is significantly increased from a few decades ago. Your link doesn't dispute that. This is because of widespread adoption of no-till farming where

Pesticide use is significantly increased from a few decades ago. Your link doesn't dispute that. This is because of widespread adoption of no-till farming where only pesticides are used to control weeds rather than plowing or cultivating. However as far as I know there is no connection to pesticides and health issues. People just think the word "pesticide" sounds scary. Exposure to viruses is interesting, but what about vaccinations? And are we sure it's just viruses that affect the immune system? That doesn't seem very plausible.