¿Interpreto mal TryStrToInt?

[Casimiro Noteví]

Si he entendido bien sobra el '!', ya que devuelve true o false si ha podido, o no, convertir el texto en integer.

TryStrToInt converts the string S, which represents an integer-type number in either decimal or hexadecimal notation, into a number, which is assigned to Value. If S does not represent a valid number, TryStrToInt returns False; otherwise TryStrToInt returns True.