A general rule of thumb is do any program exactly as written (unless you physically can’t) for at least four weeks, THEN think about making changes.
I’ve done OLAD and I’ll say this - it’s tough mentally and physically. You go all out on one exercise without leaving any spare energy for others and you’re always lifting heavy. If you don’t reduce the volume each week you could really beat up your joints and tendons. So I’d definitely advise you to cut the volume in half each week as written in the article.
I put some good mass on my body and a lot of weight on my deadlift and squat with this program, plus I think it’s made me much tougher in the gym. On the downside the low volume wasn’t good for my work capacity. But I think it’s a great program.