knetz are actually agreeing with some points and YG technically hasn't confirmed their relationship, so far it's only speculation they are dating by the media . There isn't any pic of them together from dispatch and supposedly they have been dating for a year, at least with Kai there were receipts.
and GD and Jennie aren't any idols they are probably the most popular idols in SK now and trending so their dating news isn't irrelevant.
YG don't confirm as a rule, they respect their idol's right to privacy. If GD and Jennie don't want to deny this, nothing will be said.