Im not here to defend ML but I think the problem with your post is that Loomis did not and still does not make personnel decisions. The Saints are not structured that way. Loomis gets them under contract and negotiates with agents. That was Payton and then Allen who made the personnel decisions. I agree though with the premise on how bad a decision that was back in 2018.
The next horrible decision was the 2022 draft and what they did there as well.