Henry Hill was a known bullshitter was drunk/high most of them time until his death so take what he says with a grain of salt. I’m not saying Gotti wasn’t involved but I don’t think he was the hitman. Gotti had a lot of hitters in his crew like the Carneglia brothers, Tony roach, Willie boy etc that did the hits
It’s possible Johnny Gotti was the killer. He personally shot Vito Borelli a year later