According to the Daily Mail, he himself didn't indicate that he is considering rehab. Instead, it's been presented to him as a possibility. And, it usually is a smart gameplan for those in a pickle. Lawyers make that recommendation frequently.
For one thing, the traditional 28-day stay in rehab gets the "sinner" out of the media spotlight. Laying low is usually wise after a major scandal.
For another, it is a formal way of addressing a supposed problem. Based on that platform, the miscreant could restore the brand. Or start another one. The meme is: Hey, look, I did something about my problem. Now I deserve a second chance. Actually, rehabs are positioned and packaged as second chances.
And, if there is an addiction problem - and there isn't always one - it can be treated. Or an attempt made in that direction. It's not unusual for someone without addictions to take refuge in rehabs. For any number of reasons.
The reality, however, is different. Rehabs are not necessarily effective for stopping problem drinking. The rooms of recovery are filled with many who have been through multiple rehab facilities. Unless they are ready to become sober and really want to do a 180 in their lives, no treatment modality will work.