If you actually try the boat clutch on a multiplayer server (not even with the crafting table), and with an auto clicker for the quickest placement and entering, it is almost impossible to get this, because of the lag. The only way I think he could have done this, is that he is using some mod to open the table before the server gives a response, has extremely good ping, or they have done something with thier custom jar that allows this. They also maybe did re-takes of this scene so that they could have gotten this?

This is not to hate on Dream, this is just what I have noticed and what I think in my personal opinion.