OK, let's take these in a different order, and it will make a little more sense.
1. When does a kick stop being a kick? When it is possessed, or becomes dead.
2. So what was the status of the ball when it was illegally kicked? Hint: see #1.
3. 2-24-9 is wrong on this point, it's horribly worded rule, and there are a number of us that have asked it to be fixed. The status of an illegally kicked ball is NOT a fumble, the status is whatever it was before it was illegally kicked. Now, USUALLY that is a fumble, but not always. Say a soccer player on the team does a bicycle kick of a pass in flight. Does his illegal kick make the pass suddenly turn into a fumble? Of course not, it's still a pass. On this play, suppose K32 was the one to illegally kick it. Does that make the status of the ball a fumble? No. The staus is whatever it was before it was kicked.
4. OK, so what we have is a kick that went into the EZ. What's that? It'a a touchback.
5. What is the basic spot on a touchback? The 20.
6. What was the status of the ball at the time of the foul? Loose ball play, which would normally be previous spot enforcement.
7. What's the exception to #6? A PSK enforcement! Does this qualify? Hint: yes!
8. OK, so we have a PSK foul, which means we will enforce from the end of the kick. Where did the kick end? In the end zone, which makes the basic spot the 20.
9. Was the foul behind the basic spot? Why, yes it was! So the enforcement spot becomes the spot of the foul.
10. Does it matter if it was a free or scrimmage kick? Hint: the status of the ball was still a kick.
11. If K declines, R gets the ball 1& 10 at the 20. Won't happen. Enforce from the spot, which makes it 1st and 10 from the 5.
If K was about to recover, it might not have been a bad foul by R. At least they keep the ball.