I am down with the plug kit. There are just so many different variations I was trying to figure out which kit was the best based on people actually using them.Harbor freight carries these too for $5. Same as you, probably used them 10X over 15+ years, never had an issue. I like the HF one also includes/uses rubber glue. It's what I carry in all my cars. Never tried to do one with the wheel still on the car though, which was a new realization for modern cars with no spares.
Of course, the internet is full of "the only way to repair a tire is from the inside" stuff that scares people off and leads them down all these other paths.
I think this is the kit you are talking about: Harbor Freight Tire plug kit