The correct decision was made in my view, no fire, engine still operable, good judgement used in choice of alternate.
Was this was a birdstike though ? from the cockpit those symptoms would fit the incident certainly, but then we have accounts of unusual noises from startup, and the company declining to comment.
I am not a great fan of conspiracy theories, however, birdstrikes often leave bird remains, a runway inspection would follow an incident such as this.