That site shows Riga Passenger Port in the picture which is part of the Port of Riga. The port starts from the estuary down to Riga. It then lists all ships visiting Port of Riga though not specifically Riga Passenger Port
This site lists cruise ship movements in the Port of Riga and you'll see all Voyager vists are listed as KRS which is the KS port or Krievu Sala
https://rop.lv/sites/default/files/2022-06/Kruiza kugu saraksts_07.06_eng.pdf
About half way down this site you'll see a map showing the KS port in relation to the other ports and Riga
https://rop.lv/sites/default/files/2022-05/Riga – cruise destination_0.pdf
and this site shows all the various ports making up Riga port, KS is the 8th green dot from the bottom of the map on the left bank. Click that to get a lovely high definition 360 degree view of the delights of KS port. We'll have 2 days to take in the views of the magnificent warehouses, pipes, loading cranes and coal piles. Those on higher decks with a pair of binoculars will be lucky enough to see Riga in the far distance.
https://rop.lv/en/map