I understand your concern about fatigue life. The reason this all works is that there is such limited movement and due to the shapes of the tubes the flex that occurs is spread over the length of the tubes. This keeps the localized stress to a minimum.
With so little localized flex fatigue becomes a non-issue.
And...for what it's worth I don't see "being called out" a bad thing. I just want to be sure that if someone has a question that they feel comfortable asking.
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