You're right. I guess the connection being reached for is "lymphatic transport" (title of paper) -> "waste transport" (synonymous) -> "toxin removal" (a very specific type of waste transport?)
In the context of quack and alternative medicine the term "toxin" is used to refer to any substance supposed to cause ill health.
What the body produces and might need to eliminate is metabolic byproduct or waste, nothing to do with "toxins". The term used in this context makes me cringe.