Only 25% of one's cholesterol in the blood comes from the food and drink you take in. ie 75% is produced by your body regardless. I can't remember where I read this once upon a time. But when I quote this to medical professionals, no-one argues with me.
So if you have high cholesterol, especially with diabetes, it is probably caused by the complex cycles of fats and glucose we have that is part of being human. Some of us with diabetes have dysregulated - deranged even! Blood lipids, as in that cycle is pretty out of whack. I am in this situation myself. I focus on my trigylceride level - which is indicates how your body is dealing with the fats (and glucose) you are eating and drinking, and there is a ratio with HDL fats that is a good one to track for your health.
One thing you can track regarding the effect of what you eat and drink and your cholesterol level is keep really good records of your blood lipid test results. My total cholesterol level is high, but lower, not by a lot, but lower, since going low-carb high-fat eating and drinking. As many note if you read up on this - it's about the relationship of sugars and fats that matters the most, it seems. Not just fats alone, and ditto blood sugar/carbs. (My trig and HDL levels are definitely vastly improved since LCHF eating and drinking. Which includes lots of decaf and caffeinated coffee!)
Blood lipids is about heart health ultimately, so I strongly recommend reading up on this as much as you can. There are official state sponsored online quizes you can do that estimate your heart health levels from your various test results - I strongly recommend you doing this.
Because - the concern about decaffeinated ground coffee beans is really about being concerned about your risk level for cardiovascular events.