I totally agree with you about his needing to use a better aerated soil. It will help.
But
Earth Juice will not help his problem.
It might even make it worse.
Earth Juice grow, a great product, is heavy in molasses. Molasses will only drop his soil pH lower , especially when lockout is already present.
It's obvious by the twisted and twisting leaves that pH is the issue. It's obvious by the pattern of necrosis on the leaves that a p/k deficiency is in effect. If you look at a pH/nutrient chart you will see that p/k locks out in low pH. Thus, pH must be raised to correct.
pH can be raised by flushing with higher pH water or adding a buffer to the soil. But, in this case , pH is "probably" off or low, due to overly wet soil.
Best case here is to let soil dry completely out.
Then water with plain RO water with a pH of about 7.
If it progresses worse even after this. Do a complete flush of the soil and reset.
Best of luck.
Peace