7590Fritz +7330OpenWRT Cascade VDSL?

Hello I have Internet over Fiber to the street and from there by Cable to the home with VDSL.
I used at home the 7590Fritz for Login and behind I used the 7330 for WLAN and for a PC.
Now I patched the 7330 with OpenWRT but I have no connection to the 7590 only via OpenWRT to the 7330.
Isn't that possible actually like here

or can I use the 7330 when the 7590 makes the connection?