Explanation from Youtube comments:

The 1st step is to put your finger on the bag number 1.

With the 1st ( MOVE ONE) you are forced to choose number 2.

With the 2nd (MOVE ONE) you choose 1 or 3 ( so it’s odd number)

With the 3rd (MOVE ONE) you choose 2 or 4( Even number)

With the 4th (MOVE ONE) you choose 1 or 3 or 5 ( Odd number)

With the 5th (MOVE ONE) you choose 2 or 4

so he removes number 1 and 5

With? the next (MOVE ONE) you go to 3 !

So he removes number 2

With the Last (MOVE ONE) u r forced to go to number 4.