They only approve that which they've tested for; in this case, they've only tested using this dosage as a booster. If, later, there's more testing on people who have not had any vaccine, they may expand the authorization. It's not a conspiracy.
It's there (table 5); it's just formatted differently. Presumably the original poster decided not to include it, as it added the footnote "Victims of other races are not shown separately due to small numbers of sample cases", which doesn't fit his framing.