Late Roman Army Grade/Rank List under Anastasius

[Renatus]

Augustales and Flaviales... appears to have 340 centurions

Might this suggest that Vegetius is wrong when he claims the Augustales and Flaviales were 'added to the ordinarii' (unless he just means 'added to the ordines'), and that they were a senior grade of soldier rather a type of centurion?

This seems a possible explanation but Vegetius need not necessarily be mistaken. Milner comments in a footnote to Veg. 2. 7 that the term ordinarii can be applied to ordinary soldiers in an ordo. 340 centurions in a unit of 1550-1600 works out at one centurion per approximately three or four men, which is absurd.