Legitimately, okay. Easily, that's not the case for everyone.
I've done this for a few reasons:
- The AI doesn't care about the rules and doesn't receive any penalty for cutting in front of you and making you spin or go out of the track. I'm not talking about 8-6 where the AI is clearly faster than you in straight lines (without drafting) and you're not allowed to tune your car. I've done this out of pure frustration after 3 failed attempts. All ended because the AI spun me out of the track.
- Cutting the Interlagos chicane is bending the rules, not breaking them. You still get a penalty for cutting - it's just that the game is lenient enough so you can recover the penalty very easily. If it gave you 10 seconds each time, or better, if the game would teleport you back on the track like some corners in the Nurb, that strategy won't work at all.
- This is against AI, you're not ruining the race of anyone else in the world. It's like glitching in a speedrun. Like I said, it's a "cheese" strategy, it's not meant in any way to be considered as legitimate - but for people who have trouble to win this race, it can help them.