Interesting. I did a bit of digging and the disclaimer about not being an officially supported Google product was there from the start. There was briefly a logo that used Google colors[0] but it seems extreme to fire someone over such a small misstep. I'd say either HR gave him a bogus reason like you said or he's not telling the whole story.

[0] https://github.com/googleworkspace/cli/blob/1991d536b4a45e60...