all of the side effects that people are attributing to tirzepatide seem to be ones that are symptoms of losing a lot of weight quickly and eating a low calorie diet for an extended time.

hair loss is a symptom that fits into that category.

In reality, though,

Crashing intakes tend to be self-regulating; you cannot really eat very little food for long periods without suffering.

GLP-1s make it very easy to crash your intake by simply injecting a higher dose, so the "negative effects" of crash dieting are easier acquire on GLP-1s for vast majority of population.

If one eats less, perhaps that alone could lead to hair loss.