> Only the five subjects of the Berkeley experiment have officially seen olo.

Basically equivalent to

source: trust me bro

There's a link to Dynomight's webpage in another comment thread. I've seen olo myself with it. It's to cyan what ultramarine is to sRGB blue.

The word "officially" is the massive wiggle-word here.

Only one person on Earth has officially seen the color of my coffee mug. Send me Venmo for $10, and I'll officiate your viewing of the attached JPG....

Except that this requires extremely specialized equipment to individually trigger specific cone cells in your eyes, so I expect they have a pretty damn good idea of who has seen this and who hasn't.

So, source: trust me bro.

I'd heard of weasel words but now that you mention it they do tend to be rather wiggly