I agree, but then articles like this are the reason these people are so annoyed at the installers, they make it sound like there are mysterious procedures and practices which are not being followed, while failing to detail any of them and making the problem worse.
Anyone reading this will only ever come to the conclusion that they had a bad installer and won’t want their help, all while their house is turning into a stroganoff.
I’m not aware of any insulation and rendering options that allow breathability of the sub structure. This is why any internal leaks need to be fixed and rising damp needs to be mitigated with DryRods.
Pretty much the only buildings that cannot be insulated without a massive amount of work is where the floor of the building is sitting in groundwater without a waterproofing membrane.