It was a big purchase for sure but wasn't enough to bump the markets just as tesla did. If tesla buys $1.5 Billions and sells the 10% that means they sold $150M, that's why this $100M purchase from Nexon wasn't enough to send the price up to $60k again.
It wasn't felt enough because of the timing of the buys, besides billions worth of bitcoin has just expired again, so I think it just offset these huge buys. In any case, Nexon says that they are in for the long haul so let's see the effect in the next coming months.
But this is just a train, more big companies will keep being big amounts of BTC and if that happens there is a possibility to see the bitcoin price at $100k for the end of the year.
Would be better to hear some US Fortune 500 companies creating noises, for sure being a "US" company will have significant impact to the price. Specially companies that started to criticised bitcoin but suddenly made a U-turn and invested huge amounts.