I guess I'm not sure which tool you meant was adapted; Cython (and Pyrex) certainly adapt Python to work more directly with memory, but I would say the style of code in the article is an intended use case of them.
(I also might have undersold the connection between the two, Cython is arguably just a friendly fork (I guess mostly they wanted to move faster))
I just meant that the OP is adapting Python (via Cython) similarly to how FFI-driven LuaJIT adapts Lua. The resulting programming style is different enough from classic Python or Lua that it approaches being a different language—something like an embedded C DSL.
(I also might have undersold the connection between the two, Cython is arguably just a friendly fork (I guess mostly they wanted to move faster))