Mm... great article, but I can't help feeling it skips over the important bits.
"But your boss is likely to be receptive if you politely raise the question of productivity and show you’re willing to be held accountable for results, rather than hours worked."
Yeah right.
The problem is that it's extremely non trivial to deconstruct your assumptions and social behaviour.
Even if your boss/manager/whatever is clued up and knows his/her stuff, workplaces are a social gathering, and quiet introverted non-socialising members of the team will never get rewarded for their hard work. Especially if they're seen leaving early every day.
Where I work, we have a guy who leaves at 3pm every day; he gets in between 5-6am.
His own team gives him the 'ironic' farewell round of applause when he walks out everyday.
Why? Because he's leaving early.
He's a hard working dedicated worker, but appearances are important, and leaving early makes it appear that you're slacking off, that you're not there when you're needed for that last minute 5pm meeting.
The few people who actually know what he does completely respect him; but no one else gets it.
That's the problem: unless you publize not only to your immediate work peers, but the entire local work area, what you're doing and why, no one gets it, and they make assumptions.
This article would be more useful if it addressed that issue.
Simply saying: Work hard, leave early and get your boss to accept you for who you are... agh. Don't. It wont work.