Pretty much, but yeah it's more for those that never got the chance to play those WiiU games as content-wise the changes were nonexistent or minimal. I also refused to double dip, apart from Mario Kart 8 Deluxe when they announced DLC tracks would be released, so there was like 8 years between purchasing moments.
Switch is the first to re-release a bunch of games from the generation just before, though. This is mostly due to the previous 2 home consoles being backwards compatible, so there was no need (market).
It's 6% of revenue, not profit. So it cuts even more into profits as it doesn't allow a company in breach of regulations to reduce the impact of the fine by adding expenses that will temporarily lower their profit.
Even more spicy, they can also impose periodic penalties up to 5% of the average daily worldwide turnover for each day of delay in complying. That shit can bankrupt you.