Couple things he does not talk about in that video though. One thing is without the larger tube and valve on the very end that goes in the tank, you cant stop the water flow while you are at the tank. With a Python or Aqueon you can stop it with the valve and not have to run back to the sink to shut the flow off. So you're either gonna have to buy a shut off valve for the end or run to the sink to shut it off. Also as mentioned above, there's no gravel/sand tube to deep clean the substrate with. So gonna have to buy/figure something out for that too. Another thing you'll find are that normal garden hoses kink like crazy when you use them in confined spaces like a house for this type of work.
Only reason I bring these things up is because trust me I am not against saving a buck at all, so I tried this myself years ago and found that it's really not worth it IMO. By the time you piece all the stuff together to get it to work somewhat like a factory water change hose, you really are almost the same dollar amount in the end. For me I just bought the $44 Aqueon 50' one 7 yrs ago and have used it every week since, it's a small price to pay for a quality tool you use on a weekly bases IMO.