So this chart isn't yours?You're a naughty boy, that's a lot of lies for one post ;)
The graph was made in November and posted on this topic if I recall; but obviously, I needed a few weeks to see if this was really the new baseline (spoiler: it is). NSO had a free 1 week trial and is correctly pointed on the graph (and was never changed, I did not touch this part of the graph). I don't see how this graph is "selective" as those are the raw numbers since release, with different landmarks pointed out. And finally, it is absolutely normal that the introduction of a service which effectively reduced the number of potential buyers down to 1/4 would affect the baseline sales of an almost 100% online game (now, I wouldn't be surprised if you started arguing that some people buy splatoon to play offline). You can see that Mario Kart, while also experimenting a natural decline, is much more flat as compared to 2018; and it's normal, almost no one buys Mario Kart to only play online.
One could even argue that despite NSO clearly affecting the sales of Splatoon almost overnight, the game still sells pretty well.
Now, feel free to argue against the numbers and see you in a few weeks ;)
And that arrow isn't pointing to Week 40, 2018?.... The week Super Mario Party released.
And this chart also wasn't yours?
You do remember this one, right? It was only a few weeks ago. You used this to claim there was no seasonal pattern to the drop. You never explained the weeks you decided to use for you linear fit, even though different weeks change the results significantly. And you still label NSO as if that's when it launched, when you actually mean that's when you arbitrarily think it started effecting sales.