Trump speaks in code, so it's hard to take any of his words at face value. This could be interpreted as "nuance" or, in context with a pattern of behavior, it can be seen as an sly sort of encouragement -- which is how the Proud Boys are taking his comment.

If the way the comment was received is incorrect, then it is up to Trump to correct it. Obviously, he will not be doing so.

You can draw your own conclusions.