My wife has worked as a dispatcher and we have both had nothing but good interactions with police.    I've found them friendly both in person and the few official interactions we've had.  But I'm a white, middle class male, who mostly does what is requested.
I've liked the police I've met and I resent many of the accusation people make against them that have never had to face the threat of violence/death, let alone know it's a daily risk.

I think the study is a tool.     There'll  be very little data to collect on black people because it's such a small minority.(was your use of 'thug' replacing black, that's been the recent trend)   If anything, it may show some challenges working with Hispanic folks.    

Either way it's a proactive move by the training department, a good defense for his force if they should get involved in a criminal trail over the use of force.  This supports your local police hopefully to keep them safe and effective.