I'm actually really pleased we're going for Juan Foyth. There's not enough clips of him to judge him as a defender but there is something special in how quickly and accurately he passes the ball. He'll start counterattacks going brilliantly.
Nobody's linked any more credible sources. Fox sports and BET365 say he's 179cm. The Estudiantes website is Spanish and indecipherable. The first 20 pages that Google spits out are split evenly on the subject. Plus he looks small in all his clips. If you have more reliable information, just link it.