The attack values of planes have remained the same, so indeed the defense values have been increased as the text stated.
The number 2:1 only refered to the ratio, which is normally a number compared to the number 1.
If its better understandable for you, then you can also say that the ratio was changed from 2:1 to 2:1.333... But that is not as well readable as 1.5:1
The number 2:1 only refered to the ratio, which is normally a number compared to the number 1.
If its better understandable for you, then you can also say that the ratio was changed from 2:1 to 2:1.333... But that is not as well readable as 1.5:1