I might be wrong, so please excuse me if I am, but in my understanding the topic you linked to (by @soheilsh) is about just forwarding the traffic that came [from the local network clients] to the SOCKS proxy [on a MikroTik router] into the WireGuard tunnel [between this MikroTik and a remote WireGuard server peer at a remote location] (previously – PPTP tunnel).
Whereas in this topic comrades ask about wrapping VPN traffic to obfuscate it [likely because in the comrades’ circumstances, unlike @soheilsh’s, that VPN protocol is not allowed / passed through]. Or, generally, tunnelling traffic at a MikroTik router via SOCKS to a remote SOCKS proxy server (what the Shadowsocks protocol does with encryption).