It's an ad for using CoPilot and for Raycast.
> But raycast said they didn't know about it.
If I buy a billboard that tells people to go eat at a nearby restaurant, that's ad regardless of whether or not the restaurant knows that I bought that ad.
> To me the explanation makes perfect sense. "You can use this tool with raycast" seems like a very reasonable tip.
Raycast is a paid product. Even though they have a free tier, they only have that to get people to use and like the tool enough to pay for it. They want you to use Raycast so you use CoPilot and pay for it. It's an ad.
My short search really didn't bring up any definition that included the need of the product/service owner knowning that the advertising is happening.
And the message very much qualifies as trying to bring people to buy raycast (or at minimum to use it which usually want people to also pay later on).