Arrowverse Swamp Thing

JOHN CONSTANTINE KNOWS SWAMP THING IN THE ARROWVERSE!!! In tonight’s episode about a similar creature in Maine John says he knows a swamp thing but that’s too far north for him. Think he means the ST of the upcoming series or a different version?

I am going to assume he talking about Swamp Thing in the CW universe They are not setting up for and kind of cross over between the two shows