No one is suggesting that since Molina experienced a jump in power, he must be on PEDs.
But since players on PEDs often experience an increase in power, an increase in power is circumstantial evidence of PED use.
This cannot be reasonably debated.
What can be debated is the weight one would place in "simply an increase in power" being connected to PED use. I would suggest virtually none.
But it is still evidence.