The Eastern League is a neutral league, it doesn't favor hitters or pitchers so TDA's .914 OPS there at 22 years old is very impressive.
His numbers in Vagas would be a .310/.358/.553 line in Buffalo according to the Minor League Equivalency Calculator, which is still awfully impressive and just about on par with his AA numbers.
His AAA line from Vagas also translates into a .267/.307/.457 line in the big leagues.
That is what they predict he will do based on his numbers from AAA as a rookie. But by no means does that mean he can't improve and adjust to the big leagues and reach his offensive ceiling.