I noticed some people here say there is a blanket ban on referral links. But I dont think thats right. Hopefully the mods will correct me if Im wrong!
Based on the
forum rules, referral code (referral link) spam is not allowed - fair enough. But if your post is on-topic, has good, relevant info and you include a referral link, that seems to be fine.
I did some searching and found a couple quotes from theymos and mprep that relate to this:
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Ref links are allowed if they're on-topic, which this is.
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If the post is directly on-topic (like in your example) and is constructive (i.e. not just parotting content that was already posted), it's allowed.
(You might want to visit the relevant threads for the full context.)