What happened in those years and why were they omitted? It's odd that they just leave it out with (as far as I could tell from the linked source) no explanation for that.
Nothing happened. There was no price increase those years. The chart isn't misleading at all, OP just cut off the title, "Netflix Price Hikes 2011-2023." 2018 and 2021 aren't relevant because there was no change.
Then why are 2012 and 2016 included? It's extremely confusing to have a line graph over time where intervals of time are missing, even if you clearly call attention to it, which they don't here.