The article introduces a limitation that JUNOS do not support EVPN-VPWS to use "install-nexthop" to forward traffic on a specific lsp .

Junos support L2VPN/VPLS routes to be reachable over a specific LSP, by implementing policy with install-nexthop action, rather than following the default resolution path. But this function do not work for EVPN-VPWS routes ,which is treated as a software limitation , more detail in PR1512150

Use transport class as instead:
https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/evpn-configuring-transport-class.html