I wouldn’t recommend Dianabol for this comeback. Taking it only on training days does not establish a safe regimen or make it equivalent to a workout supplement. There is no validated evidence that this schedule prevents hormone suppression or other adverse effects.
Dianabol can cause liver injury. NIH LiverTox discusses methandrostenolone and related anabolic steroids, including their association with impaired bile flow and jaundice. NCBI Bookshelf
Anabolic steroid use can also affect blood pressure, cholesterol, fertility, and mood. His previous fitness and current body fat estimate cannot establish that he would tolerate the drug safely. The NHS explains these risks. NHS
For now, the practical priority is a routine he can maintain around family life. He should start with manageable weights and training volume, rebuild technique, and increase the workload gradually. Trying to match his old personal records immediately is an unnecessary target after a long break.
Consistent training, adequate food and protein, and enough recovery give him a useful foundation for assessing progress. If unusual fatigue, poor recovery, or other symptoms persist, he should discuss them with a clinician rather than using Dianabol to push through them.