Wilson's passer rating at home: 123.6
Wilson's passer rating away: 83.1.
Seattle's record at home: 8-0.
Seattle's away record: 3-5.
Also, your stat is misleading.
They played 5 of those last 8 games at home. Only 4 of those games did they pass for over 200 yards, only 2 over 210, and only one over 216.
In those last 8 games, only 5 of those teams were in the top half of the league in passing defense. Three of them were only there because their rushing defenses were so bad that no one really needed to throw much on them (Jets, Cardinals, and Bills).
The Seahawks relied heavily on their running game in those last 8 games too (1,662 passing yards to 1,524 rushing yard). Hell there was only one game in that stretch that they didn't get at least 153 yards on the ground (they had 96 in a game at the Dolphins and they lost that one). They had 1,428 rushing yards in the other 7 games. Pretty much every quarterback is going to play well when his team can give him 204 yards per game on the ground while have 5 of those 7 games at home (and your defense gives up less than 14 ppg in that stretch as well).
So yeah, Wilson is overrated, as I said he was (and is).