I think their point is a shitty doctors diagnosis is just as invalid as self diagnosis, not the other way around. A misdiagnosis can be more harmful than no diagnosis. A diagnosis isn’t valid just because a doctor told you so, it’s valid if it’s correct.
So then you agree that people’s self diagnosis are valid, because shitty doctors can diagnose and those are valid.
I think their point is a shitty doctors diagnosis is just as invalid as self diagnosis, not the other way around. A misdiagnosis can be more harmful than no diagnosis. A diagnosis isn’t valid just because a doctor told you so, it’s valid if it’s correct.