Averages. Target scores are (relatively) meaningless being so dependent on what the game setup is like.
I always try to have a pingolf course average out between 4 and 5 and for the most part, this course looks to have played close enough to that I wouldn’t consider it a hard course. Only 4 out of 9 holes played enough over 5 to be above par and only one significantly so. If I were using that same bank, I would lower GOT to 200m and probably look at the median to figure out if there was a big disparity in the number of players getting 1s and the number of players getting 8s to make further adjustments. I would always lean towards trying to have lower scores for the less skilled players but not while sacrificing too much difficulty for skilled players.
Unrelated to your question side rant: I’ve also never had anyone that shot 58 at one of my score based tournament/league courses tell me they haven’t had any fun because their scores were high. I’ve seen a ton of people having no fun on score based courses where the one shot they must hit seems to be eluding them, the game is setup to make that single feature unbearably difficult or a mechanical issue is preventing people from completing a goal. If you’re running a pingolf event, try it IFPA style score based, I think you’ll be surprised how many players will enjoy it.