Mark, that's a fair question.
One of the earliest "bloody noses" OSHA received at the hands of the courts had to do with this isue. OSHA mandated one thing; a company had a way they felt was better. OSHA fined ... and lost in court. OSHA is required to consider alternative approaches and specific situations, not just the "letter of the law."
If it became an issue, The first thing I would point out is that the guidelines mentioned here are for extension ladders. That is not an extension ladder in the picture.
I am also confident that I could demonstrate the superiority of this arrangement over a conventional ladder, simply by tying a rope to the top and giving a jerk to the side. This 4-way ladder isn't going anywhere.
The primary goal is accident prevention ... not complying with rules, or arguing blame afterwards.
As for "I have a problem..." statements of mine ... sometimes rules are applied in silly ways, or are simply wrong. They will never be corrected if no one is allowed to challenge them. Your best piece of "safety gear" is between your ears; there just being a rulebook does not mean you should stop using it.
