In other words, he created an extremely official-looking product and released it in a way that made it look extremely official and blindsided everyone when suddenly there's a viral Google Workspace tool released by a Googler with Google branding that wasn't released by Google.
I'm not saying he should have been fired, necessarily, but he demonstrated _extremely_ poor judgement in doing this the way he did and put his manager and everyone else in an extremely awkward and uncomfortable position.