No, you have the right tracking information; http://track-chinapost.com/startems.php?code=LF254787215CN shows your parcels left China for Germany on 4.1.2018 and 5.1.2018.

Transit time to Germany for these kinds of items seems to be around 30 days right now, so I'd expect your parcels to show up sometime in early February.

These parcels do go by air. While the flight itself is fast, most of a parcel's time is actually spent waiting -- waiting in the airline's warehouse for shipping space, waiting to be unloaded, waiting to clear customs, and so on. The volume of parcels sent, the ability of the sending & receiving postal services to handle them, the amount of airline shipping space that the postal service has reserved, and the number of flights the parcel has to take -- all these have a much greater effect on delivery times than how long the parcel actually spends in the air.

This FAQ goes into a little more detail if you are interested.

I can fly to China in 24 hours! Why does a package take weeks?