Even if they would go for Tasha rules, stats would change ...
Tasha (as far as i know) allows you to alocate your Racial Bonuses (that sill exists) to any Ability Score you want.

Dwarves have twice +2 ... so that Barbarian would have 17 - 13 - 16 - 8 - 12 - 10
Elves have +2 and +1 ... so that Barbarian would have 17 - 13 - 15 - 8 - 12 - 10
Humans have +1 to everything ... so that Barbarian would have 16 - 14 - 15 - 9 - 13 - 11

But that was not the case here!
They all had 17 - 13 - 15 - 8 - 12 - 10 ...

I still dont understand why cant we change Race for our hirelings. frown
Lets us play Githyanki as racist as they trully are! frown