Yes, but it's not an absolute rule. For instance, it normally doesn't override security. If there's a (mis)feature which allows attackers to get root on you machine, and userspace relies on it, in that case it's normally tough luck to userspace.
Which means I'm not sure I would agree with this revert, as the opposite effect should also be achievable in userspace with a "chmod +r /proc/kallsyms" early in the bootup scripts. Those that want or need to enable the original behaviour can do so, while completely eliminating the (albeit brief) period of lesser security that the revert introduces for all users.
Surely the kernel should be as secure as possible by default, no?