That is really handy... I always wished that there was a "Rewind 15 seconds" or "Fast forward 15 seconds" because getting the tracking right with your finger is so difficult especially on long videos. I figured YouTube would never build it in because it could make it easier to skip ads that are part of a video (sort of with PocketCasts, how you can so easily fast forward through the ads in a podcast)
ALthough showing a screenshot of a text with you and your friend is sort of a weird way to show the tip ... SUrely it took longer to take a screenshot, modify the image, upload, and paste the link rather than just write that out... But, whatever.
best trick is to just open youtube in the browser instead of the retarded app.
...? YouTube app is great and has way more handy features than the website, like browsing videos while docking an existing video in the bottom of the screen, swipe that video up to go back to full screen, or swipe it left to dismiss it.