Superdrol can definitely cause gyno there are many cases of it happening to people. It also can cause a delayed gyno effect to where after you are done using it the gyno appears a little later. The superdrol gyno mystery is something I don't know much about but it sounds like it has something to do with progestin. I haven't been able to find any real answers on why superdrol causes gyno it seems to just be all speculation. I have taken superdrol before and got really puffy nipples and a very small amount of gyno from it. I would just research the hell out of the subject there seems to be a lot of conflicting information about it nobody is agreeing on anything in most the different threads I have found about it.
On a different note no one is arguing about how liver toxic it is so make sure you are drinking a shit load of water and start taking about 1200mg's of NAC a day until you are done with the cycle and the PCT. After the PCT I would lower the NAC dose to 600mg's a day and take it for at least a month. Superdrol is some hardcore stuff and can cause a lot of different problems. I personally would try to stay away from superdrol because of it's toxicity. I'm sure it can be used correctly and the dangers can be minimized I personally have just had bad experiences with it more than once.