Earlier quoted context omitted.
Coming from a place of ignorance, how does Smalltalk not integrate?
Smalltalk does not use text-based source files, with object source code saved as part of a binary vm image. Smalltalk is completely incomparable with unix editors, version control, and developer tools, relying instead on integrated dev tools inside the vm. Because all development and tools are inside a monolithic image, it's not very practical for writing shell scripts
This is a misleading claim often made by the author of this Medium article. Smalltalk code does reside in text files and the IDE keeps them. This is apart of the "image" that is also kept by the environment to enable faster loading and store state.