I didn't get why he deprecated distance/time as a direct way of determining average velocity. Is this pedantry about "average" vs. "mean"? As I understand it,

I didn't get why he deprecated distance/time as a direct way of determining average velocity. Is this pedantry about "average" vs. "mean"? As I understand it, "average" is a vague word, one of whose meanings is "mean". And I imagine most of the other meanings would have distance/time as their value as well.