I was impressed with the amount of detail in his spreadsheet. A cursory look tells me that his playing style is not overly aggressive. He is winning just over 50% of his sessions. His standard deviation appears to be rather conservative, and so, his profit of just under 1.5 units an hour seems to be about right. He may be well be playing quality games, albeit very conservatively. My opinion is that anyone who is prepared to record the amount of detail that he has done, has also put in the requisite amount of study and preparation. That being said, his conservative betting style is likely a combination of bankroll size and perhaps, an experiment on his part to see if he can actually do it.
This individual perhaps gets bored with a project once he has "mastered it" (a premature comment perhaps that should be taken in context) and so is going onto the next one. I would also express the opinion that is 1.5 unit per hour profit is based on a betting ramp of increasing 1 unit per rise in true count, possibly spreading to 2 hands in high counts. Because of his unit size, I would suggest that his BJ bankroll is still somewhat modest. I would encourage this individual to continue playing, to continue increasing bankroll. At such point that his/her ror approaches 0 on his current betting strategy, I would encourage this person to get some simulation software, and to increase his betting ramps based on simulations. I would also tell this individual that 3 to 4 units per hour, as you have stated, is entirely achievable.
Locally, I still use a 5.00 unit with a 5 or 10.00 min- and am averaging just under 7 units per hour for the past year. Granted, that is based on a bloated BJ Bankroll with no ror. I hope that comment encouages the individual to continue and further develop his skills.