I purchased DxO PL6 and have asked their support more than 3 times to include the Nikkor Z100-400 zoom and the Z TC1.4. It has been more than 4 months and their reply is either nothing or it is "when we feel like it".
I'm pretty sure both of those are now supported. I have my doubts any customer service reps are going to reply "when we feel like it." Are you perhaps paraphrasing?