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Yes, agreed, but whether right or wrong, under the UK Building Regulations the polyethylene (flammable) version may be used in buildings less than 18m tall in the UK (and there will no doubt be other countries which will allow use of the polyethylene version).

However, someone specified the polyethelene cladding should be used for Grenfell despite it apparently not being appropriate for the building (as it is greater than 18m in height) - so in this case it would not the fault of the manufacturer unless they convinced others that their product met all the required performance criteria. And even then there should have been due diligence undertaken by the design and build team and it would also be subject to Building Control approval...