Feels the same to me... in fact, I'd probably prefer 400ms of a static screen to 400ms of animation. Withe the static screen I can blame my internet and not think much of of it, if I'm watching an animation I have to sit there and think about how the "designer" chose to force me to wait for them to twirl around and take a bow before I can move on.

Edit: Exact test of rule 2:

Productivity soars when a computer and its users interact at a pace (<400ms) that ensures that neither has to wait on the other.

Nowhere does it say that waiting is only bad if you don't see something happening. I am waiting on the computer to finish it's little jig. That is bad, and a violation of rule #2.

Further, from the original study itself:

"When a human being’s command was executed and returned an answer In under 400 milliseconds, it was deemed to exceed the Doherty threshold, and use of such applications were deemed to be “addicting” to users."

My answer has not been returned within 400ms, this the Doherty threshold has not been met.