A CV joint will seldom ever grind but a transmission problem caused by hard hit to the wheel and halfshaft might.
The fact this guy cannot physically see a problem with the car and the fact that it apparently drives fine with no shake does not mean for one second that a problem, or several of them, does not exist.
In weeks, months, or even a year or so something nasty may rear up so it’s best to make sure a serious problem does not exist now. The human eye can only get so close.