I can confidently say that there is no good rational to do a pull through. It’s clearly not a stimulus, and as far as a teaching tool, it’s very very far being useful. At best your getting placebo benefits.
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If you have been using this, or coaching it. Stop. Don’t beat yourself up, but consider learning a bit more about exercise if you want to avoid making these types of mistakes and wasting your time.
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That being said, if someone has been claiming to be an expert it exercise, biomechanics, glute training etc. You now have another bullshit detector. You can’t understand physics and exercise mechanics and still suggest this movement. Mutually exclusive.
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I put the banded RDL in here to clear up any confusions that people may have on the similarity of the movements. This would imo be a much better teaching tool, and also a substitute for people that don’t have an incline extension machine.
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Remember the key is the forward lean while holding load. Don’t try to get too fancy, and don’t expect to be a movement you load a ton. I find it works best as a superset with a less complex exercise so you can minimize either losing or degree of failure.