Not at all. When I refer to weak parents, I'm talking about the ones who have never made the effort, not ones who are doing their bloody best and sometimes fail or who need a break. Let me ask you this - when you were at your absolute lowest ebb, did you feel lie you could/should be doing more, even though you were totally burnt out and just couldn't do it? Or did you think, "fuck it, my children are ND so if they are unable to function, there's nothing I can do?" I'm guessing the former becuase otherwise you wouldn't have got burnt out in the first place - you'd have been just letting it slide. I feel for you because that exhaustion is such a huge problem and I've spoken to so many parents of ND children who are doing their best but are just absolutely worn down by it all.
Most parents want the best for their children, of course. But there are definitely some who aren't able to do the work, whether their child is ND or NT. And in the case of ND children, I think these parents are happy to throw up their hands and say, "well, it wasn't our fault - he's ND so that's the way he is."
My DH is a wonderful parent in so many ways, but I think if I'm completely honest, without me, I don't think this would be true. He's brilliant at putting the time in, being with the DC etc, but the art of considering the bigger picture or adapting his behaviour or providing the scaffolding that DS needs just doesn't come naturally to him and on some level, he didn't think it was necessary. I've had to educate and prove and support him on this.
This is not true of his parents or siblings - who between them have at least 3 ND children, none of whom have been or are being parented well.
ETA - in my DH's case, he has never been a lazy parent. If anything, his issue is that he would just not have recognised the ND in the first place and still struggles to separate ND behaviours from behaviours that are just normal for a child of that age.