I wouldn't consider it a threat, just an overreaction. Then again, I would want to get the snake out of there and someplace safe.
Edit: So thinking about the types of people who go through the mazes (drunks and shit head teens), I can see them seeing the snake and grabbing it. If it was a venomous snake, it could do some serious damage. So yeah, I can see how getting the snake out of there could be a priority where in a perfect world people actually respect nature. However, given the location of the maze and the heat the lights would generate, I would imagine that there have been hundreds of snakes in that are over the life of the maze that people just haven't noticed. That's not to say the park should do everything they can to get rid of the snakes, but just pointing out how low the level of snake related incidents must be.
This subject is kind of sensitive to me because at KD a few weeks ago I saw some redneck bunch of fuckers kill a harmless snake in an extremely painful way for no reason which absolutely killed my enjoyment for the rest of the night. I hate to see innocent animals suffer because people are terrible.