I found a transfer meant to go from Griselda's mansion courtyard to the docks that sent the player to the central courtyard instead, but all the actual boathouse transfers seem okay. Did you mean the gate leading in, or is there something else you found that needs fixing?
Yes, currently the only way of obtaining the Adhauga Accord is destroying the Nithercott headstone. Whether you destroy it, repair it, or leave it alone will affect part of a future update, and there will be more ways of obtaining the Accord either in or following that update.
Sorry if that caused any confusion, I tend to use "event" to mean both "interactive event" where there's something to do or something happens with the story or characters, and also "game event" which is RPGM jargon for "a thing that does a thing" - NPCs, object interactions, treasure chests, enemies, doors, etc.
That line in the changelog is mostly referring to the latter. They're not important, just filling space to try to make things less empty. Chances are the only one people will care about is the new repeatable event in the storage room in the middle of the catacombs.