I read the transcript of that video. He seems to be making conclusions about the Review of the Balance of Competencies between the UK and the EU that 1: the report itself doesn't make, and 2: I find very easy to disagree with (after reading a sample of the report myself, which is extensive).

The depth of his analysis (which goes no further than the Working Time Directive!) is about consistent with most self-proclaimed experts on Law that have never practiced it themselves. The same goes for his impartiality.

For instance, his conclusion that the UK is sovereign because parliament ultimately decides what the UK courts do is nonsense: what do you think would happen if our courts started ignoring the rulings of the ECJ?