If GM is exiting Europe, will they still require IMDS entries? My understanding of IMDS is that it is intended to support EU recyclability rules.

IMDS entries will continue to be required for all GM parts, regardless of region.  The GM/Opel split requires IMDS entries for GM parts, IMDS entries for Opel parts (to Opel IMDS  Accounts) and IMDS entries to both GM and Opel for parts that are supplied to both companies.  IMDS data supports compliance to substance and recyclability regulations across the globe.  In addition, GM exited manufacturing operations in the EU, but does continue to sell vehicles in Europe.