PIR happens after a prolongued period of fat adaption/ketosis.
Carb flu happens in the early days of switching to low carb, when your body is stuttering at the lack of glucose available but has not yet got a clear fuel line into your fat reserve fuel tank (to use an engine analogy).
@Finsky is the first person I have heard of (but I haven't looked very hard) who had felt in the slightest bit ill with PIR, and it may not even have been the PIR that caused it - fasting was involved, I think, so that often causes issues. Several people on the forum report similar symptoms from fasting, unrelated to ketosis. I think to be certain the experiment would need to be repeated several times to be sure what caused the symptoms.
The (little) reading I have done report people feeling great in PIR - I certainly do. I don't have masses of instant sprint energy, but I have more endurance, long distance steady energy than ever before. Virtually no hunger... I missed lunch on Sat, simply because I was gardening. Believe me when I say that was UNHEARD of before ketosis and PIR.
And I only remembered when I got a bit wobbly around the knees - the physical activity. I had a cup of tea, a brief sit and a snack, and I was back out in the garden for another 3 hours.
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