That the emperor was once an imperial slave?
"Note that there is a difference between Imperial Slaves and Slaves. Imperial Slaves are people who willingly enter into indentured servitude to pay off their debts, and are granted the rights and protection of Imperial citizens, and are not chattel property.
They are often Imperial citizens seeking social mobility or supporting their families. Thus, unlike slaves, Imperial Slaves having free will and self determination"
From elite wiki
That seems to happen often when a portrait is given a voice, but these audio dossiers don't match the voices I had imagined, even if well delivered.