Well, in theory, that may not be the same finley that we see in chapter one. (Ik we haven't seen much of the map yet) but if it is like other parks, there may not be a way for him to get from the inside to the outside like he does in chapter 1 (plus he is a sea serpent so there is no chance he would always be there to greet guests), I think that that could be an animatronic version added to greet the people entering.
I'm not saying that this is right, but this is what I theorize (Guys I think I have a theory, a Game Theory™️ )