Anything you do as a university / person reflects your values. This shows a lack of integrity.
Why?
Why are photos of people any different? There needs to be some grounding of the presentation to what you're actually selling.
(It's also illegal for food, but that's beside the point, you shouldn't get your moral compass from the law)
Do you want an advertising picture of a puddle of melted ice cream under hot studio lights?
And why would it be illegal for food?
You can make what you have look as good as it can, and I’m sure everyone does that.
But AI fabrications are crossing the line to outright lies, which is by definition violating integrity.