The claim that heelpieces serve a specific biomechanical purpose in footwear is a matter of everyday observation and footwear design, though specialized components like heel lifts are also studied for their effects on lower-limb biomechanics.
The claim is trivially true by definition and everyday observation: footwear components like heels and heelpieces are deliberately designed for biomechanical functions such as weight distribution, posture, and gait modification. While most retrieved papers focus on broader footwear design, orthotics, or gait, paper [6] specifically examines the biomechanical impact of heel lifts on muscle activity, supporting the premise.