Heisenberg's Re-interpretation of Bohr-Sommerfeld Quantization Condition in his 1925 'Umdeutung' paper (p12)

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The paper I'm referring to can be accessed here: http://users.mat.unimi.it/users/galgani/arch/heis25ajp.pdf

On page 12, Werner Heisenberg, in the process of 're-interpreting atomic dynamics' from the principles of quantum theory, says that the Bohr Sommerfeld Quantization Rule, which says that the action integral of a period system over a closed region in the phase space is quantized and is equal to Planck's constant times a positive integer, appears arbitrary from the perspective of Bohr's Correspondence Principle?

Specifically, the equation he is referring to is equation (12) in the paper: loop_integral{pdq} = loop_integral{(x_dot)^2dt} = J(=nh), where n is an integer.

All I know is that the Correspondence Principle says that quantum systems in the limit of large quantum numbers should start emulating classical systems. I can't see how this points to a contradiction or an arbitrariness in the above quantization principle which Heisenberg seems to allude to in his paper. Could someone clarify this?

Thank you very much!
 

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