I think you might be using an older understanding of arachidonic acid.
First, it does not come from "rancid seed and plant oils", but rather from poultry, animal organs and meat, fish, seafood, and eggs.
Here is a recent perspective : ... It is time to shift the arachidonic acid (ARA) paradigm from a harm-generating molecule to its status of polyunsaturated fatty acid essential for normal health. ARA is an integral constituent of biological cell membrane, conferring it with fluidity and flexibility, so necessary for the function of all cells, especially in nervous system, skeletal muscle, and immune system. Arachidonic acid is obtained from food or by desaturation and chain elongation of the plant-rich essential fatty acid, linoleic acid."(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6052655/)

How does this weigh into our discussion? A healthy diet is always better than a poor one.
There are many definitions of "healthy" but all have in common foods as close to nature as possible, limiting saturated fats and salt, and low in highly processed ingredients. Remember, many of those ingredients are what led us to need a statin in the first place - the statin is meant to help us stay as healthy as possible and limit our risk, much the same way insulin
does not replace a proper diet and exercise regimen for a person with diabetes.