'Why' = *mechanistically driven by* (an event or something)
The nature of "why" can get off into a lot of philosophical discussion. I think in this context it should be considered to be associated with a "reason" for something.
I think, myself, that in a science classroom the "how" should be stuck to though "how" might be used but mean the same as "why" when someone is being careful.
Perhaps an honest disclaimer like: "Evo-Science knows neither the 'how' nor the 'why' with regard to its 'black-box' hypotheses, Evo-Science hypothesizing life's origins is severely flawed, etc.”)
This wouldn't make any sense. Evolutionary science couldn't possibly be talking about life's origins since it is, by definition, about living things.
Chemistry is, however, starting to open up the black box of life's origins and we can start to make some tentative suggestions about it.
However, if when you say "evo-science" you do mean biology then we do indeed know a great deal about how life changes over time. If you think otherwise it is a simple matter of deep ignorance.