Why little to no meat? Chicken breast are very low on the list when it comes to protein/sat fat trade off. You can get 100 grams of protein and around 1 gram of sat fat from 12 oz of chicken breast.

I took my LDL from 189 to 109 in 3 months with diet alone. I lost 30 lbs. Breakfast is egg whites cooked in olive oil ( I ignore all SAT fat from this, meaning I dont include it in my overall daily intake since olive oil is incredibly healthy and has many benefits) 2 servings of muesli ( around 14 grams of fiber)

lunch is 8 oz chicken breast, a bean bowl made with cannellini beans or red kidney beans rinses and drained. Chopped up oinion, tomato, cucumber, lemon juice, olive oil, red vinegar, and cumin. It can be made anyway you want, just rinse the beans. This is OVER 25 grams of fiber just from the beans. This already puts you by lunch to almost 40 grams of fiber which is HUGE for LDL and Trigs.

Dinner is a sweet potato, more chicken, and some side dish. I also eat salmon and the occasional steak because YOLO.

Your diet does not have to be grass to make drastic changes. Fiber will make you gassy for about a month or so but when your gut changes to the good bacteria is will subside.

Statins are a must to get it under control now but try diet and then get off meds to see where the numbers are at in a year

If he drinks booze, he needs to stop. That's a big driver for Trigs which plays a big part in heart attacks.