https://en.wikipedia.org/wiki/Bulgarian_umbrella is basically the same thing and your linked article mentions the CIA stole the idea from the Russians.
When they just want to make sure to kill someone, dumping a few magazines into the body and driving over it afterwards for good measure, like that ex-pilot in Spain, appears to do the trick just fine.
A lot of assassinations are sending a message
Russia abandoned a lot of the “secret” part of their dirty ops in the past decade and just farms it out