I mean all of that is true, but, speaking as someone from Croatia - we don't follow safety standards and regulations here anyway even with native workers, the quality of the bridge would definitely not be any better had Croats built it, and I doubt there even is the adequate workforce and know-how within Croatia that would be needed for such a massive and complex job. I would unironically expect the deadlines to be breached by several years had the job been given to a local company. We also aren't a rich country by European standards, so the price was probably a crucial factor.
In case you're worrying about general Chinese influence on Croatian politics, that's not really a problem, our govt is strongly pro-EU (for better and for worse), as well as much of the population.
This hasn't been reported on much, but I actually checked what that "competition" really was, back when the image won the prize. It was some local festival in Bumfucknowhere, USA, which among various other events (sport events, food tasting, that sort of stuff) included an art competition. I doubt the jury was made up of highly experienced art critics.
And besides, people should trust their own eyes. If you like the picture, you like it, and if you don't, you don't. Appealing to the critics as a source of objective artistic judgment is naive, and I say that as someone who has published some art criticism myself.