Not disagreeing with you, but just saying there can be legitimate reasons why they don't have deep knowledge on past projects besides "they're a total charlatan, a liar!" It's probably cost me jobs before, and I try to reflect on and refresh my memory on past jobs as best as I can before interviews usually.

I've even gone over notes I took at a couple of my past jobs, and I don't even remember doing a lot of those things even with it written down in my own handwriting.