Where did Ray Peat provide evidence that the anti-inflammatory effect of polyunsaturated fats was a consequence of immunosuppression?

[marcuswhybrow]

In https://raypeat.rodeo//tribute-to-dr-raymond-peat#issue-51 Ask Your Herb Doctor host Andrew Murray says

So, whilst that may have been perceived as some kind of a benefit, the Toxic effect of it was the reason why somebody felt like they were getting better. So, to the detriment of their metabolic rate and their metabolism in general it was just perceived as being a good thing, but he brought out the science of how dangerous it was and actually to get to the bottom of someone’s psoriasis or their eczema as a matter of fact to be the best way of approaching it.

Is Andrew thinking of an article or newsletter by Ray, or perhaps a previous episode of the Ask Your Herb Doctor radio show?