Hello Florian
These commands do the following:
Any communication from the outside with a destination IP address of 192.168.2.254 (the IP of the outside interface) and a port of 10022 will be translated and would reach the server at IP address 192.168.3.3 on port 22. These commands are ONLY for traffic originating OUTSIDE with the specific destination IP and port pair.
If 192.168.3.3 decides to initiate a communication to a destination on the Internet, these commands have nothing to do with the behaviour of such an action. If you want servers on the DMZ to access the internet, you must add an additional command/object. Details about this can be found at this lesson.
I hope this has been helpful!
Laz