" I am backhand dominant "

[Леопольд]

When someone says this , what does it REALLY mean ?

[Леопольд]

When someone says this , what does it REALLY mean ?

Without describing the player's style, it only means that the player plays more backhand than forehand.

That is the correct answer , but as you said, without describing playstyle.

But the problem with playing mostly backhand is as follows.
All racket sports are forehand dominant (due to huma biomechanics).
But table tennis is even more forehand dominant by nature