Just to update in case someone runs into a similar problem. They said that the requirements of the University meant that I had to give this information on the title page and they could not remove it or allow me to submit the thesis with a modified title page.
However, they said that if I gave in four copies of the dissertation at the library then the online version could be blocked for legal reasons. That is what was eventually done.
As a second step, I wrote to Google to remove the cached data. Even after the library blocked the thesis Google was showing personal data. They removed it in a couple of days.
I agree with the others that such a requirement is downright dangerous in these days of identity theft especially as in Germany banks and many others accept your DOB and place of stay as alternative ID if you have forgotten your pin for online banking etc.
My advice, if your university requires such personal data on the title page, is to hand in only paper copies.