I had applied for AU card just after card launch when there was no information about LTF offer for select employers. I was eligible for Zenith as well that time but considering higher fees I opted for Vetta. Later on got Vetta card converted to LTF based on employer offer from AU.
Now after 1yr with Vetta, again requested via email for Zenith upgrade under LTF scheme & it got approved today.
Just waiting for their reply to confirm about Zenith being LTF as well.