Since you like this video so much, let me instead use IT to show you that the AI is again not "Defending".
Example A (1:50-1:57):
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Easily had a position made but the player braked super early for some reason (in a car that has some of the most stupidly powerful brakes of all the cars in the game), that's not the AI defending.
Example B (2:46-2:54):
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Had a big run and easily could've made a perfectly good dive to the inside again taking advantage of those brakes but does not. Again, thats not the AI defending, that's the player for whatever reason deciding not to make the moves despite both the brakes AND the tires (and the most stupidly grippy ones to boot) to do so.
And for good measure, look at this (4:15-4:26):
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No other cars around, big space and a big draft and even enough overspeed to make the move with the AI not even remotely trying to cover the inside and yet again, the player doesn't do it.
Probably the most glaring hole in your defense.