I read that paragraph, but my reading of it was different from yours. As far as I can see, it only discusses training time and experience. No mention of time for sleep.

Though yes, I do give it credit for going at least a little of the way - not far enough, but a little - in pushing back on the 'human error' scapegoating, in favor of asking questions about procedures and policies.

Point. I read the sleep deprivation meaning into the phrase "pressure caused by the operational tempo, something the RN and USN would recognise" - because I'm somewhat familiar with the subject.

Try a search on "naval officer sleep deprivation", and notice just how many military, government, and adjacent sites have been talking about that specific problem. (For me, its role in accidents and collisions pops up in the 2nd sentence of Google's AI overview.)