the post is from June 30, 2015
I think it is already added, you may test yourself first.
Yes, it's an old post, but when I checked the file, the tooltip part was not there, and I had the same problem as the writer's of the first post. I inserted the code snippet, and the tooltips were displayed immediately.
I use Joomla 3.6.5 and VM 3.0.18, consequently the tooltip code is not part of the VM core, and the update files of the previous versions don't contain it.
I'm currently testing VM 3.2.1 on a test site, but I haven't checked this file.
(I have a big question concerning the new shopfunctionsf.php file, but that's offtopic, I'm going to open another topic.)