Maybe James can answer your question for other countries.
Added after a relook at the picture of the chassis inlet for the 'review' pictures, and the IEC plug. THEY ARE THE SAME. The exact SAME polarity.
Being able to '3D' the two parts, a PLUG, and a Chassis inlet, plus rotating one 180... Well, they are the same connecting pin HOT.
In the original diagram, and the link. the lower right is HOT. that PLUG, flip over vertical180 so it fits, and plug in INTO the amp review picture. Then you can 'see' the HOT pin is the same one.