No, the first tweet says that a speaker at AEA recommended #333. And the second tweet says that H&FJ–an incredibly-highly respected type foundry—had been using an even lighter shade of #444 for all of the type specimens on their website.
Then, finally, it says that 4 days after the iPad launched (that's when this tweet happened) H&FJ had been noticing that black text looks best on the iPad (as opposed to all previous knowledge). And we have no update on their final decision about iPad type color.
That's probably not the case after the iPad 3. Lighter text doesn't always look good on iPad1/2 because of the short reading distance + standard res screen, aliasing is very visible.
