Not at all, the 30.0% number is not correct and you surely know it.
He said 30% not 30.0%. If he rounded to one decimal place it should be 29.9%, but you are really grasping, IMHO.
The 30% number is correct. Making it 30.0% is technically not correct only if the 23% is 23.0%, although your making a mountain out of a molehill in this case would be rather demented. However, since the 23% number is an estimate, only, the 29.9% number is no more accurate than the 23.0% number.