I didn't watch the video, but I've owned inflatables since 1971 and have of course had to do a few patches, now and then. We've added lifting rings to our present Zodiac and they have held for years. As we keep the Zodiac on the davits whenever it is not in use AND when sailing, I think that says something.
The most important thing about inflatable boat repair is not the glue. We use a 2 part epoxy and it works just fine. The most important part is the prep work. There can be no foreign matter on the joints to be glued. NONE, NADA, NIENTE, ZERO! The tubes must be sanded so that there is no shine left to the grey, even if it shows some of the cloth material. Even the oils from your fingers will inhibit adhesion.
The dink must be fully inflated to the shape you want it to have when finished after the glue is applied; no glue will hold if the material changes shape. A transom joint is difficult and (not to be a downer) almost impossible for one to do successfully at home. The professionals will remove it completely from the boat for cleaning and prep, rather than try and do only one side. If your transom is wood, it most likely will need to dry out before you can begin the process of repairing it.
I have no idea of how much hp you push your dink with, but if you normally zip around on a plane (we have a 15, 4 stroke), don't expect that repair to last too long. There is a great deal of torque on the transom of an inflatable pushed by an outboard motor, especially when encountering wakes and waves.
Good luck and if all goes well, you should be able to extend your dink's life by a few years.