@op I hope I can give some factual insight.
Should the manager be discussing your specific rating, technically no. But is this other person a Lead or highly trusted in your team? Then I would say yes, the manager can and will ask for input. Should names be used, no. What this really shows is your manager trusts this person but this person is betraying that trust to gain yours for some reason.
You have not been Pre-Rated. This is always how it works. While technically your review is not due/set until early next year you have already been rated. We all have. What is happening now are calibrations with your +2 and other teams that perform similar functions. These take time. Your IM needs to be justified in documentation as much as anyone else’s Exceeds.
You can jump on the ageism bandwagon (not saying you are, but some do) but the distributions and adherence to standards has now hit Fatality level. Calibrations are absolutely the most in depth they’ve been this year from those in the past. Adding to your skillset and taking on more, while admirable, may not exceed what others have done and may be overshadowed by seemingly minor lack of adherence to functional standards like RTO, time sheet submittals, etc.
It’s all about the manager and how much they are willing to fight the good fight plus you clearly documenting actual wins for the employer. Example increasing your skillset is a win for Wells but a weighted one. If I was able to automate X which saved 3 minutes per transaction equating to $5mm saving a year in man hours it would be more valuable.