How do I access the Dr Wu DLC after purchasing?

I saw Bestinslot's videos and was pretty excited and he seemed to access it simply enough but once I purchased it and booted the game up I went to the island screen and no option to go to the secret location on Island 2, I then restarted my PS4 and tried everything again. Please help guys! I want my spinoraptor [noob][noob][noob]
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