UPDATE 28 February 2021: In a statement to GamesRadar+, Google says VGC’s report “was inaccurate and reported hearsay as fact” and that VGC’s assertions about cancelled Kojima and Yu Suzuki “projects” are not true.
It further added that Google “[doesn’t] have anything, nor have announced anything, with Kojima or Yu Sazuki”.
Asked specifically about the Kojima games pitch, a spokesperson told VGC: “We talk to partners all the time in situations that don’t result in a project or even a proposal. This is very common. Speculating that two parties that speak regularly in this industry leads to proposals or otherwise, is inaccurate.”
That doesn’t sound like a very robust denial to be totally honest. We know Kojima had a project in progress on his own, so if he was talking to Google about it going to Stadia and Google not biting would still line up with the chatter online.