FYI. I had the same issue and attempted your solution but it did not work for me. Luckily, I got the right syntax with the help of @usbenny himself from the #vlc-support slack channel, which resolved my issue. I'm running the latest VCF Cloud Builder 4.10 BTW:

For the 10.50.0.1 subnet

ip route add 10.50.0.0/24 proto static scope global nexthop dev eth0.11 via 172.27.11.2 weight 1 nexthop dev eth0.11 via 172.27.11.3 weight 1 nexthop dev eth0.12 via 172.27.12.2 weight 1 nexthop dev eth0.12 via 172.27.12.3 weight 1

For the 10.60.0.1 subnet

ip route add 10.60.0.0/24 proto static scope global nexthop dev eth0.11 via 172.27.11.2 weight 1 nexthop dev eth0.11 via 172.27.11.3 weight 1 nexthop dev eth0.12 via 172.27.12.2 weight 1 nexthop dev eth0.12 via 172.27.12.3 weight 1

Hope this helps someone.