Yes I believe he understood that he has to identify himself.
That id is statutorily compelled.
The question is can the crown use a statutorily compeled statement as evidence at trial?
Assuming that statement incriminates this individual?

I have been researching R. v White as a possible defense at trial for a friend that has a drive suspended case. His initial statement was the only thing that identified him to police. He was handcuffed and placed in the back of the police car which I think most would call being placed under arrest. ...