There's a problem in how the information has been run through the filter of the writer's interpretation of the comments of the AMD PR rep, then further filtered by a translation from (English/?)German/English and finally filtered by my own understanding. Having said that, it looks like the writer is taking disparate information and drawing a conclusion.
AMD has said that hUMA will greatly increase performance.
AMD rep said that PS4 has hUMA while XBOne does not.
Therefore, PS4 should have greatly increased performance over XBOne. This (PS4 having better performance over XBOne) is supported by statements made by developers.
I didn't read the specific article but did the AMD person ACTUALLY say that the xb1 has no Huma or was that another issue to be clarified.