Yes. This is also somewhat consistent with the RPI.
http://warrennolan.com/basketball/2017/schedule/Oklahoma
_33 .. Overall Strength of Schedule (SOS)
185 .. Non-Conference Strength of Schedule (SOS)
So the strength of the Big-12 raised OU's SOS in the RPI up to #33.
One of the main reasons OU's SOS, like many other big 12 school's SOS's were high is due to the round robin. You are guaranteed a road game against whoever makes the tournament from your league. So we faced 6 NCAA tournament schools and the NIT champs all on the road. We faced them st home as well, but the road past is the significant part. plsces like the ACC, who are top heavy don't get that boost due to the size of the conference.