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yep - also leafs and general bits dropping on it build up and sit there and potentially grow moss etc and slightly increase chance of water penetration.
With the roof the trad way is to do battens across the rafters with the waterproofing membrane gently sagging under them- then if water gets through it doesn't sit (this is what i've done). But more minimal roof eaves to wall details like your reference probably deal with the roof and walls in the same way, so studs and roof fully lined in osb, wrapped in membrane then two layers of battens, then metal. Bear in mind you need to vent the cavity at the bottom / eaves / ridge - and should really use insect mesh too (i forgot to do this !!)
All this said - were talking proper details here (more or less good enough for a house) - which may be overkill depending on your aims.
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Sheppz
Ah ok! That explains why I was having a headache getting the fixing points to align with my studs & vertical battens only! Ali Dymock seems to think that you'd get away with hoizontal battens only if they're chamfered but probably not worth the risk of water pooling if it finds its way in.
Black tin shed rings a bell now you mention it, will UTFS.
Edit: completely missed the link
edit edit: the shed will be under a big oak, which occasionally drops quite large branches (though it did get a good trim a couple of years ago, so hopefully less now) so I should probably consider durability from that.