I suspect "3rd down" is rather a moveable feast on that thread at the moment, just that I couldn't see any mention of the specific cladding system named in the planning applications ...
From the documents linked lower down, the system named is "Reynobond rainscreen cassette" which (without the brand name) is the phrase used in the planning docs
polyethylene core ... yes that might melt and drip down in flames like the mobile phone footage seemed to show!
wonder if they specified the FR version, but the FE version got fitted?