The user you're replying to is saying that the GIL is preventing multiple threads from executing Python bytecodes at once (preventing some classes of race conditions and ensuring thread safety). They are absolutely correct.

The GIL doesn't solve or prevent all classes of race conditions (which can stem from complex interactions with databases, the filesystem, etc). Removing the GIL though, will only make things worse from that perspective - making the language more difficult to work with (for non-technical people).

This is exactly why Python should be further simplified, and not made more complex - given the population which uses it most.