Heat shrink/solder connectors of all types have been in the industry for at least 20 years.. We used them exclusively to wire George Sweey's 8 second tube chassis GS back in the early 2000's.. They are expensive, purchased in small quantities, typically about a buck a connector, vs pennies for the crimp stuff. Never made it far enough on the video to check out their pricing, but looks like a decent product. JW
When I rewired my boat I bought those off amazon.. They were a pain to use in the boat itself. lots of fails On the bench they worked pretty good. Boils down to just where you are going to use them.. I prefer the ancor wire connectors ( marine supply ) ant the ancor wire...
I build business jets for a living, and we use these “all weather connectors” (that’s what we call them) all over the plane. Once installed properly, they’re virtually failure proof. I found a supplier and got some for my garage. I installed a new stereo in my DD using them. Just have to make sure the splice connector is proper for the gauge wire you’re working with.