The difference between the 100 minutes and 96 minutes run-times will be down to the 4% speed-up factor you get with PAL DVDs, videos, etc.
PAL system video material runs slightly faster than it should (25 frames per second instead of 24 frames per second) so a film that ran for 100 minutes in the cinema will be over in 96 minutes on DVD even though the content is frame-for-frame identical.
Blu-ray movies play at the correct speed of 24 frames per second (same as in cinemas) so the 100 minutes run-time will be correct. Sounds like the distributor has simply copied over the information on the back of the box (i.e. soundtracks, run-time) from the DVD version.
According to IMDb, the previous heavily-censored German version was cut by 10 whole minutes. The film should be 101 minutes in length (they always round run-times up to the nearest minute) so the 100m43s run-time on this Blu-ray is correct and the film will be uncut.