As I said on the other thread, the different start/finish points are used because the track entry is on the right at the end of T13, so there's no speeding past the pits.
Suzuki-San is using a racing line at places like Bergwerk, etc. You'll see it used during the 24 footage. In places though, his line does look awful.
Add a few seconds for T13 and deduct 25 for GTB section and it 7:05ish BTG lap. None too shabby.