He played this game only one week after arriving in Switzerland and he said that he was suffering badly from jetlag. This also was his first game on European ice and it was a very tight and tight checking game against the team with the leagues best goalie (Jeffrey Meier) and a legit nhl player (Tyler Benson) as well as several NL-players in the lineup. What do you expect? That they play him 20mins?
You're not gonna get a spot in the NL these days. Even with legit NHL level that's difficult because clubs can't spend any money and don't want to give spots to players who could be gone before the end of the season. Othmann got his gig with Olten because they don't have to pay him and because his uncle is a club legend and was smart enough to organize him a Swiss passport in the summer. Without that passport, 0% chance he could be playing pro hockey in Switzerland now.
Again, the spot next to Nunn and Knelsen, two of the best foreigners leaguewide, is pretty much vacant. He got to play with them in game 1. Should he get to play with them on a regular basis then he'll also get to score a lot at pro level while many draft eligible players won't get to play much at all and certainly not at pro level. In Europe, nobody waited for 17yo kids so this is a great chance for Othmann. Most other draft eligible can't just find a pro team in Europe because they don't have these connections and no European passport. Even Mason McTavish was apparently held up at the airport because he doesn't have a Swiss passport, just a Swiss playing license. He was also expected to play for Olten but they don't know if this is still gonna work or not.