This is done automatically in a somewhat different way. So my advice is not to worry about it. But, yes, it shouldn't hurt and and it should help in the situation that viglink doesn't fire. In those comments, Wei Dai agrees that this is the referral code.
Part of the reason why I'm asking is because that info might be old. Apparently "ref=nosim" was obsolete two years ago, and I don't know if that's still the right VigLink account, etc.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.