I just see it on Facebook, presented as the right way to do things.
I am old enough to remember being taught those splicing methods but that was when they soldered them after making a solid mechanical connection.
I also saw it in this house but the wires were not soldered. The joints were twisted together tightly and a stinger was folded over against the splice before it was taped. I think I have all of those spliced removed now along with all of that old Romex. It was easy to spot. Brown plastic insulation, TW conductors that were tinned.
On the positive side, I saw no signs of heating on those splices. I should have saved a few pieces of that wire.
