The screen definitely looks brighter, but the camera is also pointed further to the right (notice what keys are within the frame). IPS definitely helps with viewing angles but as you can see by [0] you still lose brightness as you move to the side.

Since it is a single tweet, we cannot really take it as seriously as we could if they explained their methodology and showed that it was repeatable.

[0] "Conventional IPS" slide: http://www.j-display.com/english/technology/jdilcd/pictureq....