Go on then, drive a 'coach and horses' through them.
Dehydration is a real risk at the beggining of breastfeeding. It can in rare instances cause serious problems. These can include brain damage and death. I agree that we need to be careful about which studies and accounts we look at, but its undeniable that it happens from time to time.
Just look at the Spanish doctor. She's an emergency doctor for goodness sake, and she sought frequent attention for her baby, who ended up very ill by day 4, and now has permament disabilities. She's not someone who avoided medical attention.
Its not nice to think of babies being harmed by any form of feeding, but I find it deeply hypocritical that as an intended formula feeder, I should expect to put up with being told that I'm harming my child, I'm abusive, and that my baby might die of contamination, but when I talk about risks from breastfeeding, suddenly its like the world has ended, and I'm scaremongering.
Its not nice, but its what a lot of us put up with. Either we properly clamp down on people who are being judgemental about bottle feeding, or we should accept that criticism goes both ways.