It is relevant, because they are marketing the 3090 as a gaming card to make the 3080 look good.
Imagine the ckickbait headlines if they started doing that with quadro cards.
"OMG the 3080 has better gaming performance as this $5000 RTX A6000 for only $700, how do they do it?! "
If Nvidia is willing to admit that the 3090 is not a gaming card, then that gives them space to crank the clocks on the 3080ti until it meets/exceeds the gaming performance in most situations. And then people will be talking about how it as just as good as a 3090 for ~$300 cheaper instead of focusing on how its about the same as a 3080 for a $500 price hike