Please NOTE that the the documentation page is for the MX, the vMX has currently different features.
unfortunately the vMX will have feature parity planned from version 17.x onwards, at least that I got told from the EVPN-PLM team at Juniper.
There are conflicting information regarding the 16,2 version, maybe it will be in in that future version.
"EVPN with VXLAN (VNID distribution) A/A and A/S" from 16.2 onwards
according to a mail I got from a juniper SE the 16.1 only supports: "EVPN with VXLAN (DP learning) A/S stiching" whatever that might be but it is definitely not full blown EVPN over VXLAN
regards
alexander
PS but hopefully someone from Juniper can give an official statement about that