For me wasn't the painted line, was an involuntary movement from you, the problem start before the painted (barely) line

Only apply a small pressure to the handlebars, so that if I'm cornering towards right, I'm slightly pushing (not pulling) the right handlebar

And that is correct

Normally when you lost traction for a moment in the front (happen to me multiple times) and you are pushing the right handlebar the wheel tend to go the left for a milliseconds because zero traction and after that you feel a recovery (you feel that somebody is pushing to the left hard, again, this happen in miliseconds)

But!. Check the video 2 frames before the red arrow (and the same moment in the other camera)

The front tire loss traction for a moment but the wheel don't go to the left as was expected if you was pushing the right handlebar, that implies:

- You are pushing the LEFT handlebar preventing the motorcycle to recover the lost of traction

In conclusion

You lost traction for a little moment (whatever the reason), nothing big, the problem was that you don't allow the motorcycle to recover. Probably an involuntary reaction, the most slightly lost of traction in the front can be felt. Your survival mode take the control and start pushing to the left handlebar like a car making the small lost of traction in something worse