They’ve laid out the critical data in a post titled Election Hack Report FAQ. This report includes clarifying that, despite their headline, they were not claiming that the report truly traced the hacking to Russia. I thought that was pretty clear in the first place, but I suppose “headline only” readers (not my favorite people), might get confused. In any case, the FAQ makes what they are and are not claiming clear.
Link to my previous note on this. Note that my headline is also not intended to imply that the link to the Russians was proven. I intended humor.