He means exactly that, a good blow with a hammer will break most secure locks so it is permanently unable to open - not break it open but break it closed. It's what they are designed to do - a good safety feature which is essential for the diamond list.
The CiSA Astral-S is the best anti-pick...
I have always tried to buy BSI kitemark items however the 3 star euro cylinders are reasonable in showing it is robust but does not show which are the best and anti-pick, anti-bump proof but it seems a lot of locks can be picked looking on Youtube. The videos stopped me buying the yale 3star...