I have just tried again and it does not seem that the SRV records have been removed by owncube. It still redirects to a timeout… Do you have any updates from the owncube team regarding this problem? Did they say they removed the SRV records?
[devvv@deusex ~]$ host -t SRV _carddavs._tcp.andrei.owncube.com
_carddavs._tcp.andrei.owncube.com has SRV record 0 0 2080 ocshared-de18.owncube.com.
[devvv@deusex ~]$ nc ocshared-de18.owncube.com 2080
Ncat: Connection timed out.
The code used can be copy and pasted in every linux terminal. host and nc are pre-installed normally. You could try it with a live cd / live usb yourself without having to install a linux distribution