I'm so annoyed by the term "human-turned-mutant" in LREF. The Annihilator is a mutant. He was born on earth, but he was always a mutant. He just didn't start exhibiting his abilities until he was in adolescence, which is normal in the super world.
Just makes it clearly obvious that the writers of LREF didn't put much thought into learning about Mighty Med. So much time is dedicated to Annihilator, and I'm pretty sure he's the only villain we know for a fact has a comic about him. And they go and get literally the first detail about his backstory wrong.
And you can't even say "oh, well maybe Oliver forgot-" Fuck off dude. He worked in a superhero hospital because his knowledge on them was so vast and specific. Not to mention he had to actually fight The Annihilator, and he'd only read that comic a year ago at the most.