No it doesn’t put what’s on disc on-screen directly, and no one has ever claimed it does, (Only native 4K can do that) as XPR can only put 2 (4.15 million) or 4 (2.07 million) separate images on-screen, (The original image has to be split into 2 or 4 separate images) however due to the poor performance of human senses (The eye) the speed that the separate images are put on-screen one after the other is too fast for the eye to see, and so it combines the 2 or 4 separate images into 1 image, the trick (Which is where the 4K processing of the input comes in) is to make sure that the pixels in the separate images that are displayed on-screen, when combined by the eye do not produce any artefacts that the brain can identify so that the eye sees the same as the input. (It is a technical engineering solution to a problem, (And it could be called magic as it is the equivalent of sleight of hand) but it is only a means to an end and can be ignored by the normal user who’s priority should be to compare the different projectors to see which they prefer)
NOTE: What the projector displays on-screen (2 or 4 separate images) is not what the eye sees, (1 image) so don’t fall into the trap of combining the two, (They are completely separate operations) plus the 4K spec only requires 8.3 million pixels to be produced by the projector on-screen (It doesn’t specify how) to meet it. (Hence it is technically classed as 4K)
Anyway it will be interesting to see how it sells as it does seem more complete (Full 4K input 18Gbs and horizontal and vertical lens shift) than other 4K DLPs on the market.
Bill