Learn German well in China, pass APS audit, and apply to engineering colleges there through Telford. According to your audit results, apply for an institution that meets your performance level. There are many good engineering colleges in Germany. You can check it on DAAD's website.
Personally, I haven't heard much about the school recommended by your teacher, but it seems not bad after checking, but I don't know which is the dominant major of this school. It is still recommended to go to the DAAD website, which is very detailed.
Finally, I suggest that all students learn German well in China, or learn grammar knowledge clearly before going out. After going out, they will teach in German. Besides improving your oral English listening, you still need to figure out your own grammar, so why not learn it well in China?