They're speech is in English text, but every word that they use is "jibberish." I am wondering if this text is ancient Japanese, current Japanese, or something like that.
I don't know what language, but yes it's a actual language. If you search it up in google adding meaning in english after it, you'll get the meaning of words they say. Source: Tyranitartube watching https://youtu.be/6ZAt7Ub9Ruo You can see him searching the words