I'm pretty sure this doesn't follow Le Chatelier's Principle
Le Chatelier's Principle does not directly say what happens to concentration ratios.  Nor does it directly compare conditions after a disturbance with those before.  It says what happens only after a disturbance has been applied.

Here, the disturbance is adding one mole of A per liter.  When equilibrium is re-established you have only an additional one-half mole of A per liter, the rest having reacted to form B.  The initial addition of A has been partially offset, which is exactly what Le Chatelier's Principle says.