Issues with fat digestion often are the result of not enough cloline in the diet from avoiding eggs and red meat.   Awesome.

Eating foods that make you feel better. Good Plant based diet, not so good.  In addition, for Celiac Disease, when you eat gluten free there are food fortifications that are required in not gluten free processed food but are not in gluten free foods.  In addition to the list on this website, consider iodine (in the US population iodine intake deceased and choline (eggs, meat, dairy, fish) deficiency... 7 Nutrients That You Can’t Get from Plants  

Your biopsy results indicate several key findings that are consistent with celiac disease: Partial Villous Atrophy: This means that the villi (small finger-like projections in the small intestine that help absorb nutrients) are partially flattened. This is a common feature of celiac disease. Increased Intraepithelial Lymphocytes: This indicates a higher number of immune cells within the lining of the intestine, which is another hallmark of celiac disease. Crypt Hyperplasia: This refers to the enlargement of the crypts (glandular structures in the lining of the intestine), which is often seen in celiac disease. Loss of Goblet Cells: Goblet cells produce mucus, and their loss can be associated with inflammation and damage to the intestinal lining. Mild Increase in Chronic Inflammation: This indicates ongoing inflammation in the lining of the intestine. No Evidence of Dysplasia or Malignancy: This is a positive finding, indicating that there are no precancerous or cancerous changes in the tissue. The conclusion of “partial villous atrophy compatible with celiac disease” means that these findings are consistent with a diagnosis of celiac disease.

It looks like the test specific for celiac disease is negative, but your  immunoglobulin A is high. Did they do a total IgA test? This is usually done in case you are naturally low in IgA, which can cause a false negative result with your TTg-IgA test. An immunoglobulin A (IgA) test measures the level of IgA antibodies in your blood, but it isn't specific for celiac disease. IgA is one of the most common types of antibodies in the body and plays a crucial role in the immune system. Doctors may order an IgA test to diagnose problems with the immune system, intestines, and kidneys. It’s also used for kids who have recurrent infections and to check for autoimmune conditions like celiac disease, arthritis, and lupus. IgA antibodies are found in mucous membranes of the lungs, sinuses, stomach, and intestines. They help protect the body by recognizing and getting rid of germs. This article might be helpful. It breaks down each type of test, and what a positive results means in terms of the probability that you might have celiac disease. One test that always needs to be done is the IgA Levels/Deficiency Test (often called "Total IGA") because some people are naturally IGA deficient, and if this is the case, then certain blood tests for celiac disease might be false-negative, and other types of tests need to be done to make an accurate diagnosis. The article includes the "Mayo Clinic Protocol," which is the best overall protocol for results to be ~98% accurate.    

This article, and the comments below it, may be helpful: