Delayed cord cutting is not the same as lotus birth. You might be delaying cutting the cord for half an hour or so after the placenta is delivered, if even that long (not sure how long it is, tbh, but I've never heard of it being so much as an hour!). It makes perfect sense to wait until all the blood in the placenta gets into the baby, not to mention that as long as the placenta is attached, it helps to supply the baby with oxygen. IMO, it's a matter of making sure the baby gets what's coming to her.
I haven't heard a single cogent argument about physical benefits of lotus birthing, only that it makes for a 'calm' baby and birth experience. It is not a tradition in any culture we know of, and I can't think of a single animal that does it either, though apparently it was observed in chimpanzees. It makes absolutely no logical sense to me, not even on a spiritual level. Theory is it allows baby to slowly let go of her attachment to mama's body...I was of the mind that loving arms and breastmilk helped baby to stay attached to mama.
To each his own, I suppose, though I question how surely one can avoid any sort of decay, even with a liberal salting.