PCB Design: What is the minimum value of Via Dia and Via Drill size?
I would call SeeedStudio and talk to their manufacturing (or CAM) department. Different shops write their specs in different ways, and it's costly (in both time and money) to misinterpret what they're trying to say.

In the manufacturing process, first the hole is drilled, and then it is plated. The plating causes the finished hole size to be smaller than the drill size.

However, Advanced Circuits, for example, assumes that the hole size in your design documentation is what you would like your finished hole size to be. So, if your drill file has a 10-mil drill, what you get is a 10-mil finished hole.  They automatically increase the drill size so that the finished hole size is what you specify.

(I am not affiliated with Advanced Circuits, but I have been very satisfied with their services)

So, give SeeedStudio a call (or an email) and see what they say :)