I completely disagree with him. I feel the internet has vastly freed me up to try different types of cooking, dishes, and ingredients. I see the same thing with friends and family members.
For starters, I don't believe there was a golden age of experimentation before the internet. Growing up my parents had a pretty impressive library of cookbooks, and were very adventurous cooks. Most of their friends were the same. That said, as a high school student in the 80's I could frequently tell the specific recipe used when we went to friend's houses for dinner, i.e. "this is the Julia Child Boeuf Bourguinon", "this is the Joyce Chen Beef and Broccoli", "this is the Silver Palate Chicken Marbella", and so on. Even people with a large collection of cookbooks would be hard pressed to find more than a dozen recipes for most dishes.
For me the internet changed all of that. If I'm making a dish I can read dozens of different recipes from all over the world, and even use Google translate to read recipes in foreign languages. During the World Cup last summer I made dinner based on the teams playing that day. While many were straight forward (Spain, Germany, England) I also made traditional meals from Croatia, Uruguay, Iran, Costa Rica, Algeria, Ecuador, and others. I never would have tried to do that without the internet. I learned a lot about cooking from doing that, and much of what I learned from that experience now shows up in my daily cooking.
I think he misses what's going on if he believes people follow a small set of recipes online. I'm sure some people do follow directions to the letter, but they probably did the same thing with cookbooks before the internet, and I doubt they had ten ramen cookbooks in their library.