If the link highlights anything its more that the whole drive is a pretty similar temp all over, backing up the belief its mainly general heatsoak over time, rather than high point heat. it's hard to be definite because all drives will differ by there design and components used.
Not wishing to shun that persons results at all, but it was measured with the drive on its edge. How long was it like that for? because we all know heat rises.
With those infra red sensors to get a close comparison, all surfaces should be the similar colour too.
It's easy to say in theory cooling the cover wont do much but it seems to in practise, true it may not be as good as cooling the motor or sides, but to infer it doesn't work well is incorrect in my experience. It really depends on how efficiently you need to cool them, balanced with other important factors like space block design & layout.
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