ATR = Automatic Thrust Reserve increases thrust automatically in case of an engine failure - The word "reserve" indicates that not every take-off is maximum thrust
Of course since not every takeoff is performed with one engine out...
Flat rating values are referring to normal operations (not ATR) meaning that thrust is actually limited by a 25C OAT. The FADEC protects you from exceeding the limits, it doesn't mean that operating at the limits is good for the engines.
During previous exhibitions in Dubai not a single VLJ manufacturer had any available information about performances above ISA temps when requested.