Yes, the URL says Season 4 and Im fairly certain that the last time i checked, it was still named incorrectly Season 4. Which is probably what it started out with, now they probably noticed their mistake and changed the name, but the URL stayed the same.
But its definitely supposed to be Season 5, compare it with National Geographic and you’ll see all the episodes available to stream there are the same that TMDB has now listed as Season 5, previously called Season 4. Meanwhile on Trakt, they are listed incorrectly as Season 4 https://trakt.tv/shows/trafficked-with-mariana-van-zeller/seasons/4