Do the following experiment:

1) Put in the same folder where you had that marketing blurb, a new blurb. Make sure it is unique but still looks like english. Example: now your startup allows you to fly to the moon in rockets powered by angry tweets.

2) Try to force a reload of copilot. Maybe reinstall it?

3) Recreate the conditions that suggested the first blurb, but trying to suggest the second blurb.

4) Share the results, I am curious.

If you get that suggestion, you have proof and reproductible steps for others to get proof. If you don't get that suggestion, we can't be sure, but the odds of it being just a coincidence increase.

Good luck!