buses – How to get from Gdynia or Gdansk to Leba

I was expecting a train to go. But, no matter where I look there is no train connecting the two cities. Nor a bus.

I based my assumption on
https://www.rome2rio.com/map/Gdynia/%C5%81eba
which states there should be a train. Other sources also refer to trains.

I expected to find the connection on either
https://www.intercity.pl/en/
or
https://rozklad-pkp.pl/en
Both display ‘no route found’.

I checked Flixbus and Blablacar, both with no success.

I really want to go to Slowinski Park Narodowy over the weekend.
Does anyone know how I could get there – taxi would cost 75€ one-way, according to rome2rio.