This sounds harsh. In cases you are a significant contributor to a launch it should be signifiend in the "launch entry" (there's an internal tracking tool for all launches).

You then of course need to sell your contribution:

  - It was nothing less than ciritical for the success of the project
  - It required deep technical knowledge
  - It required communication with other teams
  - It required mastery of several technologies, etc.

The teammate in question should hepefully support these claims.