Yes you need both an adapter (link 1) and a converter (link 2). Hopefully you have noticed that the input and output voltage of the adapter is the same, so without series connection of adapter of transformer; boom.
/e I just reviewed the link and noticed that if you buy the Voltage-Converter you do not necessarily, need to buy an adapter. It looks the necessary power cord (for Germany) is included. That particular transformer on the other side is total bull. You would need to buy an adapter and a power cord for the socket or the transformer, depending on the adapter for the input alone. I think it's designed for countries with similar sockets but different voltage like us <-> aus.