Heat treatment is a weird one, sometimes it can make a frame weaker. Federal used to offer a frame as standard, or for a little more heat treated, the heat treated ones had way more warranty returns so they ended up taking away the heat treated option.
That doesn't look like a Euro bb in that pic to me, but it's a little tricky to tell. Also that's not a direct comparison to the "test" (not exactly scientific haha) that Jaff did as the frame isn't on a surface. I also very much doubt it had 0mm flex, unless it wasn't with his full weight?