Welcome to the forums. This is an older version of View but maybe it will be of some assistance.
Yes, It supports NLB. here is an old guide www.vmware.com/files/pdf/vdm20-load-balancing-guide.pdf
Can the View Secure Server act as a NLB?
Not itself... but it can use other NLB tool.
For example (although it is suggest to use external load balancer) you can use Windows NLB.
Andre