I wish youtube had a level of intellegence meter on the person that made the video.
Yes, it will work, but the amount of vacuum that it creates is so small that it takes hours and thousands of pumps to do any good. Brake bleeders do a slightly better job because they are more efficient.
For better results, a dedicated powered pump is the way to go.
Oh, and stirring works just fine if yyou don't want to spend money on a pump. It just requires a lot of care.