The absence of exploitation is indicated through consent,
no, it's not. it's exploitation by the barest definition, like exploiting a fallow field or a forest. the definition of exploitation can by synonymously defined as "use". using a corpse is exploiting it. using a corpse which has, with informed consent, been consigned for use is still exploitation.
the barest definition is a synonym of "use". the vegan society could clear up this ambiguity but they have chosen not to do so, and there is no reason to assume they prefer a special definition of exploitation.
If you want the barest understanding, I guess the barest definitions are "good enough". If you want a more sophisticated understanding then you have to take the time to understand the actual philosophical lexicon that the definition relies upon, since, as it points out itself, "Veganism is a philosophy".
Y'know, considering your username is commie, I'm surprised you don't have a better understanding of exploitation, as Marx was really pivotal in developing that philosophical concept.
Approximately 0.01% of lemmy's user base would conflate simple "use" with exploitation. I warned you about sophistry before. If you have knowledge relevant to the domain at hand, put it to use, or stop wasting both of our time.