Surely, as with any hair advice, whether it not you can use rinse out conditioner as leave in or whether you can use conditioner on/near your scalp will entirely depend on your hair type.
I wouldn't dream of doing either of these on my 1b veering towards 1a hair which can barely tolerate any sort of conditioner without looking lank and weighed down (please, anyone who has this hair type, what shampoo do you use? I dream of finding the perfect one but everything is either too moist or too squeaky clean). But I'd never assume the same advice applies to someone with 4c hair.
This is where Sali always falls down. She doesn't even seem to know her own hair type, or at least doesn't treat it as if she does.