The phrase "mold removal" can mislead because it implies mold can be fully eliminated from a building. In reality spores are always in the air; the goal is to remove active growth and return spore levels to a normal, safe baseline. That is what remediation targets.
Remediation is also about containment and safety. Ripping out moldy drywall without sealing the area spreads spores everywhere, so a remediation plan controls airflow, protects the rest of the home, and disposes of contaminated material properly.
Most important, remediation addresses the cause. Removal without fixing the moisture source is temporary; remediation includes drying the structure and correcting the leak or humidity so the mold has nothing to feed on.