"So exactly how will telling his W about an “EA” with LFL make him more committed to his marriage?"
Telling his wife is about building trust. Seriously. There cannot be major secrets like this between them if he expects to build intimacy with her.
Go check out that website I mentioned...survivinginfidelity.com Read the different forums, there are separate ones for betrayed spouses and for wandering spouses. Maybe that will help you understand how important this is to someone who has already endured one betrayal....or any. Of course there are some folks who prefer not to know (but really, they are a minority). The decision not to tell a spouse about something like an EA or PA...is a selfish one on behalf of the wandering spouse in the fact that it completely takes the betrayed spouse out of the equation as far as choices and decisions go. The fact is Chrome's wife has a right to make informed decisions about her life and her marriage...in not telling her, he takes away that right and knowingly continues to keep this secret from her...which is in its own way, continuing the betrayal.
That's the last I'm going to say on this, but I encourage you to visit that website. There are currently over 14,000 members on there with new people showing up EVERY day....and it does a wonderful job of giving the perspective from both sides.