> That is fascinating how the more knowledge and reasoning we can get our hands on and actually produce, the higher the risk of us, as a species, to become actually much dumber.

This has always been true. There was a time where someone had to teach farming to others and that information had to spread and be passed down. Eventually, farmers became better than hunter-gatherers and they became known as hunters. The information on what was safe to gather for civilisation got passed down as 'safe to eat on the hunt' because the farmers were farming. The civilisation collectively "forgets" foraged foods as that knowledge becomes niche.

Does that mean we got dumber?

If you're not familiar with it, I recommend looking up the Taoist concept of overdevelopment. Sums it all up perfectly.