In that case, removing „perhaps“ would have helped a lot. It is not about maybe being hired, but about maybe being interviewed.

They don't want to guarantee an interview to everyone who sends them an improved solution, either.

If three people send them improvements, they'll probably get interviews. If three thousand do, the problem is easier than they thought or amenable to an LLM or one bright person figured out a trick and shared it with all his classmates or colleagues or all of GitHub.