I haven't seen the data for that statistic, and it's quite possible that the data sample was skewed.
However, I agree with others that as mammals, if the number of women couldn't physically feed their children within a culture where it was the norm and supported well wasn't the vast majority, we'd be dead. Maybe not 97% high, a lot things in the human body can go wrong, and it may be that things in lifestyles we've changed to over the years has had an impact, but it's still most of us. A lot of the issues are cultural bias around breastfeeding, breasts, and mothers.
Also, I think you mean mothers with certain disabilities and conditions, not all of us, babies with certain disabilities and medical conditions that impact their feeding. As others said, being disabled doesn't automatically mean someone can't breastfeed. We just get a different flavour of shite for trying.
Part of the reason I got so much shite with my kids, particularly my older two, was because I was a young disabled mother. I spent my entire first pregnancy having anytime I dared mentioned intending to breastfeed being told that I probably couldn't. Midwives challenged it, telling me 'you know you don't have to try that', being told how I was the only one on the ward doing it, I wasn't allowed to leave hospital without my son having his sugars tested because it was presumed that I couldn't possible be feeding him well enough as I am. One midwife got social services involved about it, telling me they wanted to talk to me about it (social services thankfully knew it was all BS and went to handle that themselves, I never saw that midwife again). This was all at a hospital that supposedly was meant to be promoting breastfeeding - but it certainly didn't with me.
I got over that hurdle, I then got the remarks about how it's disgusting, how it makes others uncomfortable, how there is nothing wrong with a bottle. After about 3 months or so, I started to get the remarks about how it must be a sexual thing for me.
Mothers get shit on regardless of what we do. The idea that the pressure is all one way or the other is just not true - most of us just see the pressure that we've been under far more clearly.
And that's extremely short-sighted, because there's credible evidence that formula causes autism.
I've at least three autistic kids who were all breastfed for at least 18 months, never had formula (fourth is still on the waiting list for assessment).
There may be as others said some difficulties both autistic mothers and children face in breastfeeding - I know I would get very touched out to the point my skin felt like it was burning from too much touch. I had one child as a baby who wanted space/not to be touched while sleeping from 4 or so months old and so would push away when done with feeding when tired, which did cause some issues trying to ensure she fed well enough (even as a teenager, she's still the type to eat just enough not to be hungry and forget at times that she needs to eat).