But he says it with no real conviction is my point

He comes across as a man who no longer believes in his own spew

The players probably find him quite pitiful as well

In my view the "motivation" of players is not the job of the manager, that's the job of the fat salaries that each player is paid.  In other words, player motivation is down to each player himself.  What the manager has to do is create the culture within that creates that self-motivation and has the players bouncing into training on a Monday morning desperate to impress and play in the next match.  Then keep repeating and refreshing the process by making demands on players and having replacements on hand to reinforce their need to keep delivering.  Every so often Jock Stein would drop/rest a big name who thought his spot was safe and sacrosanct.  It was amazing how their game would sharpen up thereafter.
After a run of convincing a player that he is the best in the business and needs to give his best the line wears off and then so does the performance level.  And the very worst thing any manager can do, in my view, is make excuses for players in post-match interviews.  Once they start down that road it is only a matter of time.

Cameron Archer spent last season on loan at Solihull Moors and Caleb Chukwuemeka at Corby town ffs

Quite what Carney's brother has to do with it I've no idea.  But tbh that sums up your lack of attention to detail