chore: Clean up out-of-date comments for aggregate refactor

[2010YOUY01]

Which issue does this PR close?

Part of #25006

Rationale for this change

The refactor has been completed functionally, this PR updates the comments to keep things in sync.

What changes are included in this PR?

What is the testing strategy for this PR?

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.69%. Comparing base (2c31327) to head (b7f42bb).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25007      +/-   ##
==========================================
- Coverage   81.69%   81.69%   -0.01%     
==========================================
  Files        1127     1127              
  Lines      415386   415471      +85     
  Branches   415386   415471      +85     
==========================================
+ Hits       339360   339417      +57     
- Misses      56091    56111      +20     
- Partials    19935    19943       +8     

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