The article explains this in a lot of detail. Pixels are not pixels until they’re on a display, and different displays (CRT vs LCD for instance) display pixels

The article explains this in a lot of detail. Pixels are not pixels until they’re on a display, and different displays (CRT vs LCD for instance) display pixels differently in very not-subtle ways. So one interpretation of “remaster” is to emulate CRT-pixels as LCD-pixels through filters. Another is to re-design the pixel art to be optimized for LCDs.