I thought it was ozone depletion, not greenhouse effects, that led to the fluorinated gas phaseout?

The original ones yes. They are already banned - but the next generation of fluorinated refrigerants are apparently ok for the ozone layer but have a greenhouse effect. That's my understanding anyway, I'm far from an expert.

Edited to add: https://en.wikipedia.org/wiki/Kigali_Amendment has some information on this.