There is no this lap time on “Auto Bild” 06/2001. We can find the only one test of BMW Z8 on Nordschleife “Auto Bild” 18/2000 without information about lap time.
https://www.autobild.de/artikel/bmw-z8-33686.html
(This article from “Auto Bild” 18/2000)
Also we can find in my opinion absolutely true lap time by Horst von Saurma on 20,600 m configuration of Nordschleife on “Sport Auto” magazine issue (08/2000) — 8 min. 18 sec.
https://www.autotestversand.com/e/12831/sport-auto-08-2000
(This issue)
So if we can, please — fix it.