What he claims is that he was not made aware of this before the verdict, which is like the most classic bullshit handwave but anyways.
It still is significant though because if this was included it brings the case from something that people can squint and reluctantly accept as kind of checking out, to being such absurd bullshit that several buildings would burn down in the backlash. The original case was still within limits of standard accepted legal bullshit maneuvering.
In the revolutionary courts, "the defendant is a demon child who thirsts for human bloodshed unending" will be admissible evidence even if it makes the jury declare a guilty verdict on pure principle.