As noted in that thread, the advisory is not about or for LDAPS, it is about signing the LDAP traffic and binding the channel securely. Thus yes, UI++ has used secure channel binding and signing from the beginning.
> "Can only use minimum of LDAPS at work."
Are you sure this is a requirement? I don't know of a way to require this at an AD level. Is the network blocking port 389? As noted, don't confuse secure the LDAP channel with LDAPS, they are two different things.