You make a good point, at the same time it's worth considering that a number of notable people in the EU (or just Europeans more generally) have talked about the petition within the last 48 hours. It's not impossible that this is all entirely natural, but it feels a bit odd. It seems mostly to be coming from Germany, Poland, France, and Spain within the last 24 hours, which are all countries with large non-English speaking populations.
We ultimately can't know just how many, if any, of the signatures are false. At the same time, it would require Mald's people and anyone else potentially looking to fuck with SKG to be fairly good at what they do. It's not outside the realms of possibility, just unlikely.
But we will have to wait and see, nobody knows what the future may hold.