Not true at all.
He overachieved.
OK ST did not & does not have anywhere near the resources of their counterparts in the Big XII & regionally in Oklahoma/Texas. He went 170-90 (65%) with a 12-6 Bowl record.
OK ST was never viewed as a viable contending program until he got there, he set that standard for them to even be expected as a winning program.
Won the most games in school history & put together the best season they had ever had in the modern era.
It fizzled out & they couldn't keep up as the money flood came into CFB, but to act like he wasn't a good Coach based on the last 2 seasons isn't an accurate assessment of his body of work.
He did more with less than the majority of Coaches that get high praise.
Very few could win in a situation like OK ST.