Yes if we talk about stable which is stretch then that might be still working , but im using now buster and testing it with vbox-whonix-15. so instructions for e.g which doesnt work like
virsh -c qemu:///system net-define Whonix-External.xml
error: failed to get network ‘Whonix-External’
error: Network not found: no network with matching name ‘Whonix-External’
This one i faced in buster , i dunno if something changed as well in stretch.