No it's not. When you go out with the stat "Highest TV audience for a WC match ever" you can't just use tv share... Because there could have been, for example, 1 million people watching TV this time and 70% share is 700 k, while 8 years ago the highest share for a match could have been 50%, but 2 million people were watching TV. So which one is the higher audience, the 1 million 8 years ago, or the 700 k the other day..
The TV share is a nice modern marketing/advertising trick, which is used to masquerade the declining TV audience. But, when you go out with a grand claim, just give the actual number of viewers.