What is meant by this quote on 6/14?

In the explanation it says:

“This operation is mathematically equivalent to floor dividing and multiplying by 2 (respectively) for every time you shift,” So how then? the example 0b000001 << 2 == 0b000100 (1 << 2 = 4) (1//2)*2? this would mean 0*2=0 so this is not what it meant.. So my question is what is exactly meant by this mathematical equivalence?