After drooling over this picture all day I decided to try it last night. I thought my new Ninja Master Prep would be great at beating egg whites. After some time, still no stiff peaks. So I got out my hand mixer to whip them into shape. It did a much better job, and I thought I was done but the instant I tried to fold them into the chocolate, they sort of deflated. I think I may have gotten a tiny bit of yolk in them but figured it was too late, whatever. So into the oven it went. I was scared to open the door, but I peeked through the window now and then and I didn't see it rising like it was supposed to. After the hour was up, I took it out and it looked like a soupy mess. I put it back in for another 10 minutes or so but didn't want the edges to burn. So I let it cool and then as the recipe instructs, I put it in the fridge without a taste, as tempting as that was. I thought overnight refrigeration might perform some miracle on it. Took it out this morning, and it looked decent, but my first forkfull was more like fudge instead of cake. I nuked a slice and after 30 seconds part of it bubbled and part was still cold. It was a ooey gooey mess, but still delicious. So rich that I couldn't eat more than that one piece. This could be a good thing. So the rest went back into the oven on low for a while, and now it has more of a cake like texture.
Meanwhile, I decided to google and self-diagnose. It seems like the reason it did not rise and fall was due to the egg whites. So next time I will make sure there is not one speck of egg yolk and maybe add a little cream of tartar.
My creation is edible, just not as pretty as I'd hoped it would be.