It strongly hints that even if this is 'only a POC' that their actual implementation is still vulnerable since their POC failed to protect against the very attack is was written to protect against.
But I am reasonably convinced that the CRT values are loaded into the normal heap, where they're available to a normal Heartbleed attack. Pinckaers doesn't have to be right about all his points to be right---just once---and I'm pretty sure he's right at least that once.
Still, I stand by my point of view that at the time of writing, akamai's POC was presented neither as an absolute final fix nor as their own production version of it, and judging it as such was misplaced.
That akamai realized the flaws he noted in their patch also applies to the real world code doesn't change that.
I never said the flaws he pointed were not real flaws nor unimportant ones, I merely disliked the ridiculous and unjustified tone he used to to destroy a proposal and used the same against him.
void *custom_malloc() { };
It's only a POC though so you'll have to adapt it. You can go ahead and begin praising me and flaming my critics.