I don't see the point in arguing about the definition, but I don't think the message was trying to persuade people to buy raycast. What interest would microsoft have in that? Rather, it seems to me like it was trying to tell raycast users that they can use copilot through raycast.

Regardless, even if the dictionary definition of an ad doesn't require that the ad be created intentionally, it's still the case that if you say "ad" everyone will assume you mean something that was intentionally created to sell a product or service. I recommend checking out this classic post about the noncentral fallacy: http://worstargumentintheworld.com