No that simply means it's not the most accurate.
Hackers target the platform that is the most valuable to them. In the case of traditional operating systems or computers the market share numbers are so vastly different that the number one platform is target.
In the case of consoles, the numbers are close enough that hackers have chosen the platform with the most likelihood of having credit card information stored on them which happens to be number two.
I will leave the comments about which platform is easier to hack for someone else.