No, it is qualitatively different because it happens in-line and much faster. If it’s not correct (which it seems it usually isn’t), they spend more time removing whatever garbage it autocompleted.

People do it with the autocomplete as well so I guess there's not that much of a difference wrt LLMs. It likely depends on the language but people who are inexperienced in C++ would be over-relying on autocomplete to the point that it looks hilarious, if you have a chance to sit next to them helping to debug something for example.