[kingdomcome50]

Many of the concepts listed above overlap significantly between languages/frameworks/etc. Of course there are always idiosyncrasies, but having experience with one approach will significantly reduce friction when learning the next one.

But more importantly, you also don't need to very much about the above if your goal is just to reach competency. My understanding is the OP was claiming the candidate will be competent because "he knows how to program". Now that may mean anything from "candidate has written a python script to display a graph once" to "candidate is the lead dev of our game engine".

If the former, then of course, yes, they would likely struggle a little bit at first (though I would expect competency within hours -- many frameworks, as part of their core design, aim to reduce time-to-competency). If the latter, give them a brief overview of the system architecture, point them at the docs, hand them a ticket, pat them on the back and walk away.