At the bottom of the bus stop is rain going down a dirty surface. Given it’s in London, I’d be surprised if that wasn’t there.
It really doesn’t look like ai. Look at the background and the reflections on the ceiling. Those all make way too much sense for this to be ai. I’ll say it’s possible that this is edited. Someone could have swapped out a different bus stop ad.
What would be in a Trump salad? I’m guessing chips instead of croutons, and nothing even remotely green.