I don't know if I agree with PFF here. Wilson is completing more passes under pressure but seemingly for far less A/YPA in those situations, as he's taking WAY more sacks than before. Of course the OL is going to get a lot of blame for that, but I've probably seen at least 2 sacks a game on average where I blamed Wilson for the sack.
PFF gives a strong grade because of Wilson's high completion rate in those situations, but I would look closer at A/YPA than they did. Like all of PFF's player grades, there is a subjective element to the grading system, so whether you like Wilson under pressure or not depends on what you look at in some cases.
What I do love about PFF is the situational stats they sometimes spit out. For example, they mention that Russell's raw YPA in non-play-action throws is at 8.8. That's a phenomenal number for any QB, but it's especially encouraging for Wilson, who's had to lean on play-action like a crutch earlier in his career.
Overall I think Wilson is playing well and showing some good signs. That said, to me it feels he's far less effective at escaping and creating 'magic' so far this year compared to previous years, and he's taking more sacks that I'd put on him than in previous seasons. I'm also disappointed in how he's struggled to connect with open receivers or exploit matchups with Graham. I know he's trying, but I expected better in that regard.