What the document say is below which means starting 10.x you cannot use MCS to install UCCX. At no point it says that you cannot install UCCX 8.5.1.11002-22 on UCS, in fact till 9.x UCCX you can install it both on virtual and MCS
Only virtual servers are supported from Unified CCX release 10.0
Refer below:
http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-contact-center-express.html#8.5
Regards
Deepak