I hope you are wrong about this. Everything I've read says it's a 2 'adjustment' trigger, the manual, the Umarex site, even the review mentioned above shows photographs of a trigger guard with 2 holes and the appropriate screws beneath.
I believe a metal trigger blade is an optional extra or post-sale upgrade if you feel the need. I think the Century has a lot going for it, it reminds me of a modern version of the HW35, German, barrel catch, 30mm piston, 2 'adjustment' trigger ... I'm cautiously optimistic.
Hopefully the delrin ring on the rear of the piston works OK so you probably won't have to 'tune' it.
Bigtoe, thanks for the reply
[edit: appologies for (mis)using the term "2 stage trigger" when I meant a trigger unit with 2 adjustments. I am suitable contrite]