Does modular approval mean my host product is automatically compliant with FCC and ISED?

No. Modular approval simplifies transmitter certification, but it does not certify the finished product. The host device must still comply with unintentional radiator requirements, RF exposure rules, labeling and user manual requirements, and any applicable co-location or simultaneous transmission constraints. The moment you integrate the module into a real enclosure with power supplies, processors, displays, cables, and other radios, you have created a new RF system. FCC and ISED both regulate the final composite device, not just the module inside it. Treating modular approval as a full product approval is a compliance trap.