I'm somewhat guessing but I think the apparent contradiction is due to tempo. Tempo as a metric is offense-oriented -- it measures offensive possessions, not defensive possessions (ref:
https://kenpom.com/blog/help-with-team-page/).
Therefore, if a low-tempo team (Houston) meets a high-tempo team (e.g. Alabama, a team they lost to), the defensive efficiency (which Houston excels at) can still be maintained even if they lose because they are defending a higher-tempo team. If your defense forces an offense to shoot 20% but they still get their normal number of possessions, you're still defensively efficient.
The key thing is that
Alabama's reduced offensive efficiency w/high tempo may still out-score Houston's less reduced offensive efficiency w/low tempo.
Put pseudo-mathematically:
Code:
ORtg(Houston)*AdjT(Houston) - DRtg(Alabama) < ORtg(Alabama)*AdjT(Alabama) - DRtg(Houston)