If Oklahoma had beaten Georgia in the 2017 (season) Rose Bowl, instead of losing in double-OT, about 95% of this "Oklahoma has a crap defense" and "Oklahoma plays in a crap conference" talk would disappear.
And Oklahoma should have beaten Georgia in that game. It took some unforced OU errors, Georgia refusing to fold when seemingly beaten and instead launching a great comeback, some fortune smiling on Georgia, and Lincoln Riley puckering up late in regulation and then again in the 1st OT for that game to end up the way it did.
Then the narrative about OU is significantly different, and we don't see any speculation about whether a 13-0 Sooner team should be omitted from the CFP.
Much difference on the basis of one different data point.
And nobody seems to have noticed Mike Stoops has left the building and that the Sooners made a huge improvement in defense from the 2018 season to 2019.
To the question in the OP, yes, the Committee will be influenced by past-year results. It shouldn't be, and the members will try not to be, but they are human beings, not computers.