That’s how it should be ideally but it is not. I know of the folks who spend much more than what’s actually required for Infinia upgrade with a combo of different CLs.
1. CL>9L - Denied
2. CL<8L - Denied
Reasons not given, cited internal policies.
At the same time, we have people in this forum who didn’t satisfy either of these but were offered Infinia. I remember someone mentioned in of of the posts that he had less than 5L on his Infinia from upgrade of Neu or Millenia don’t remember exactly.
Ideally, try for an upgrade when you satisfy the known criteria, your case will be strong and escalations to PNO etc would work better. My take.