(I'm an Indian that learned C++ in school using Turbo C++ 10 years ago.)
Outdated? The point of learning programming at that age is to understand the basics - functions / if / for / while, structs / classes, and pointers. All of those work the same in Turbo C++ or in the latest MSVC.
Sure learning C++ via Turbo C++ doesn't prepare the student for modern code that uses `<algorithm>` or `std::shared_ptr` (or `std` at all), but those can always be learned later. The basics are more important.
If anything, the fact that Turbo C++ came with graphics.h meant I could make screensavers like starfield and a visual sudoku solver by myself without any hassle. It made programming fun and was certainly part of the reason I'm a programmer today. I'm not even sure how I would do those with MSVC or gcc today, let alone 10 years ago. WinForms + GDI? SDL? Both are much more complicated than what I remember of graphics.h's API.
Edit: graphics.h was the header with the graphics API, not conio.h