Sulbutiamine doesn't act on serotonin. There is no reason to assume that it would be contraindicated with SSRIs.
The article you linked is just some knucklehead who has a blog and no sources to backup his claims. I wouldn't trust the information on it again in the future.
Ok. But apparently you shouldn't take dopamine-drugs on SSRI either. For example, according to drugs.com, amphetamine is a MAJOR interaction with
Zoloft and may cause serotonin syndrome:
http://www.drugs.com...-2057-1348.html
Wtf?
That's just as bogus as the claim that sulbutiamine and SSRIs are dangerous. There are likely hundreds of thousands of people who take amphetamine and an SSRI on a daily basis. Drugs.com will tell you that practically any two drugs which have any effect at all on serotonin can cause serotonin syndrome. In practice, serotonin syndrome is incredibly rare, and it usually takes substantial amounts of a combination of SSRIs, serotonin agonists, serotonin precursors, serotonin releasers, dissociatives, etc. in order to trigger it. I have personally experienced serotonin syndrome on a combination of zoloft and DXM, and I ended up perfectly fine with no need for medical attention, but I would not do it again. Drugs.com also told me that I would get serotonin syndrome combining sumatriptan (a serotonin agonist) with zoloft, but I did so many times without issue. I would recommend using a variety of websites, user experiences, as well as a pharmacist, in order to find out about drug interactions.