Not even going to attempt this without advice
Already frustrated at the prize money
It seems hard. The other guy starts 5 seconds ahead of you with a better car. He has higher top speed than you. This means that if you start the last long straight together you will lose.
First you must catch him. I catch him between
Hocheichen and
Quiddelbacher Hohe (that first top with the fast right hander)
The AI does not employ late braking or 'good exit' strategies. You must catch him with these.
Then you must stay far enough ahead of him that he doesn't take you out, again by driving like a maniac and defending your position with any means at your disposal. This is not fair racing - it's a fight to the death.
If you do it right you get to the final straight ahead of him. He will catch you. You will defend. He will probably get past you at the top of the hill but now we're so close to the final 3 corners (the second gear ones) and the clue is to reach those first...with late braking from 350 km/h to 30....at the last corner.....after all that driving.....BANG.
Well we'll get there eventually

It's the best race in the game I think.
I made a thread about it, it isn't even that hard. I'm a Nürburgring noob and not a great driver, but I managed to do it 7 seconds under the gold time the 2nd time I've got to the finish line. TCS on 1, ABS on 1 and sensitivity on 7.
So why don't you link the thread then? Otherwise your comment is
useless not very helpful.
I'm a Nurburgring aficionado and consider myself competent and I'm 7 seconds off the gold. I can see the gold but I'm going to have to drive for my life to get it. Thus I'm really interested in your thread.