you learn Python to get the basics: what are variables, what are values, what is control flow, what are functions, what are modules, how does it fit together as code to perform tasks. Worrying about the memory and the underlying machine can come later. The biggest problem with Python as a beginning CS course is that it´s not a great language to learn about types (meaning it's more difficult to learn the cluster of related concepts expression, value, type, variable).
I guess I have different thoughts about what the basics are. I would advocate to start with assembly, but I’m biased because I started with assembly. Things like what is memory? What is a register? What is the Program Counter? What (really) is the call stack and how does it work in memory? Fetch-decode-execute? Jumps, conditional branches, loops. Address modes.
If you know these things, then you know how the computer actually works, and a lot of the mystery of C is behind you already.
Then you can start introducing stuff that’s built on top of it all like types, if statements, pointers... build the building from foundation up, don’t start on the second floor and tell the student not to go downstairs yet.
That's not a good way to teach someone to code and there's a reason why absolutely no curriculum on the planet does it that way. If you're teaching someone how to operate a car you start by showing them which pedal is the gas and which is the brake, not by explaining to them how a differential works. The pedagogical basics and the lowest level system primitives are not the same thing.
Bottom up vs top down. A lot of people benefit from a top down approach, especially those who haven't already decided they want to heavily invest in the subject.
