I watched the short version of the video.
I noticed you only put one coat of glue on the veneer and cabinet. The directions say to apply two, which I have always done, but is has seemed like overkill and makes trimming more difficult.
I'm glad you lasted through the whole thing Mike, it's mighty long and I imagine all but the most tenacious leave the party early!
I double checked the instructions to see if I was way out of bounds. They're somewhat ambiguous and state "two or more coats of adhesive may need to be applied to the substrate if you use a paint brush or foam roller. However, a glue roller has a tendency to apply the adhesive a bit thicker".
I've also used two coats on the substrate,(which I interpret as the just the MDF), in the past and still might if surface was really porous, uneven or larger. In this case, the surface of Ranger MDF is really dense, smooth, dead flat and also relatively small. I judged a single coat was adequate by how it looked when applied and after drying. I don't have any reason to doubt the bond attained and assume the instructions are written in a cover-your-ass way.
I'm generally not an advocate of the "more is better" way of thinking, and in this case more just thickens the glue line to no advantage. Using the glue roller and applying fairly heavy coat would seem to address concerns.
Anyway, that's my seat-of-the-pants evaluation. Perhaps I should qualify in future video.