No, I don't think he's weird at all. Myself, I have never tasted any of the pet food which I have bought for my cats and dogs. However, my father had tried some of the dog biscuits and he told me that they were rather nice to eat. I imagine pet food should be safe for human consumption.
Well, I find it pretty weird and sorta funny that the guy would even be willing to admit he eats dog food and put it in print! It does remind me though of something my friend told me last year. Her daughter was marrying a guy from England and his family came here to Michigan for a couple weeks to stay for the wedding and preparations beforehand. The father picked up some crunchy treats off of the dining room table to nibble on before dinner. He later told my friend about eating them and realizing they were cat food, not human food. She feeds her cats on the table so the dog doesn't eat the wrong food. So on the wedding day, everyone had little favor bundles of candy and mints at their seats - except the father of the groom; he had a bundle of kitty kibbles!
It's no surprise what some people can do. I've read of pet owners who taste their dog's food first before giving it to their dogs. If my memory serves me right, I believe it was Holistic that tasted the best.
You might want to read about Simon Allison. He tastes dog food for a living-before it goes to the shelves of Marks & Spencer.
My niece used to love dog treats when she was 5. Whenever she stayed with me, she always had to have one when my Lab had one. I couldn't believe her teeth were strong enough to chew through them.
I remember years ago, I tasted dog food. We were giving our Collie canned food for awhile. I have no idea why I decided to taste it. It was the saltiest food that I have ever eaten. I only had a small bit and that was enough. I hope they have improved it since the 1980s.