What is the reason to say that the Planck time was the first moment of the universe and there was no an even smaller time?

01 January 1970 1 8K Report

tp^2 = ħ.G/c^5

I don´t see any reason whatsoever, since the definition of the gravitational parameter could be lower than 1, that is B = hc/Gm2 < 1, time may be lower than Planck time

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