I read a news about terrorist attack:

Berger said oskar Kobani, aside from being sole example cited, was a military-style operation, not a terrorist attack so the formula, should it hold up, might only apply to large-scale sieges.

Does an example introduce you to the sentence “the formula, should it hold up, might apply only to large-scale sieges.” as a conjunction What is a formula of “Should it hold up”?

Why does “should it hold up” look like a question sentence. I want to ask why it was written in this structure.