When the motor is not running the PCM uses a sky high STFT as part of the "fuel enrichment" motor starting strategy. So having a very high STFT value may not be a "problem". So the short answer to your question is, "the motor is not running lean at the time". But as far as the PCM is concerned the CHT was showing an over heating condition. So that's the DTC thrown by the PCM.
ah I see, I recently drained the radiator and refilled. Most likely there is air trapped in the cooling system as I did not "purge" any air out.
As for the fuel trims I'll check those on live data see if anything is out of spec.