Bengals didn't fall for a trap. The Bengals aren't going to be good.
The fact of the matter is, Cincinatti is overrated, and New England is probably (a little?) underrated, so people got surprised by a result that shouldn't have been that surprising.
Cincinatti last year was an average-at-best offense with a bad defense. New England had, yes, the worst offense in the league but they had a top 5 defense. They had something they were legitimately good at and it appears they will be again.
And Cincinatti achieved their average-ish quality on offense with Jake Browning finishing the year, who actually performed better than Burrow last season. The idea was that Cincinatti was so close (since they had a decent record) that getting 'Joe Cool' back was going to put them back up top. Only if they are getting the same Burrow who played last year (and it looks like they have), that's probably a slight downgrade.
This team wasn't really 'good' at anything last year and they just downgraded at QB. Is it a big surprise that they might lose to an elite level defense?
On the Seahawks side though, here is why I don't buy the trap storyline: We had a very slow start on offense. We gave up two safeties. There is no way we're going into this game being complacent right now.