So, If I understand correctly, we can only get those five species (Suchomimus, Styracosaurus...) if we buy this deluxe version? They won't be in the base game if someone purchases JWE after the release?
Traditionally, developers will make small additional content purchasable separately at a relatively higher price. If we think about it, base version of the game is just less content at reduced pay, because the deluxe edition is at the traditional full price. There's about a $5 (American) difference between the editions, so that's a dollar a dinosaur. If they become purchasable post release, I wager it'll be a couple of bucks more.
This also sets the stage for possible post release DLC including new dinosaurs, possibly ones we see in the movies or other media that didn't make the final cut of base game.
Alternatively, other devs will lock content to the edition they're exclusive to. The tricky thing with JWE is the nature of the content that is locked to a specific version and the fact that deluxe is traditional full price and standard is reduced price. This isn't simply just skins, this is full-fledged content. If it's not available as a separate purchase in some form, I wager there will be backlash.
That being said, I already bought the deluxe version lol.