Apparently, at Digitec-Galaxus, even if they explain things, the modifications are made on a sheet, but not on the one of its little brother of another grey colour (Amplifier existing in grey and black). This is a pity because it is the best way to discredit yourself in the eyes of your customers. This amp is described as a 9.2 channel and not 7.1! The sheet for the same model in black is not accurate either. What a shame!
On the Marantz website: SR6015
The information contradicts with your link to a technical description in German, here is the English version: https://www.marantz.com/-/media/files/documentmaster/marantzna/us/1866-marantz-sr6015-info-sheet-w-xbox-update_111220.pdf
The world of entertainment electronics is so lacking in seriousness, no wonder people are not that interested in the wonderful field of "home cinema".