Total capacity refers to the amount of slack the cage can take up.  For a 1x, it's max vs min cog, a 9-46t would need 37t capacity.  For a 2x example, an 11-32t with 50/34 chainrings would need (32-11)+(50-34) = (21)+(16) = 37t as well.  What you need to find out is the max cog size.  I would guess that since max cog size isn't listed (in the descriptions I looked up) and it's usually paired with 11-30t or 11-34t cassettes, that it's unlikely to work well with a 46t max cog.  I would rather find a rear derailleur with same pull ratio than use a big drop bracket.

To add to what acedeuce802 stated... RD's are also spec'd w/ a min cog size. I'd be cautious of using an 11t min cog spec RD with a 9t small cog unless you have prior knowledge of it working. In some cases an after market cage can be swapped onto a given RD to make it work with particular cassettes.

There's a bunch of news hiding in what looks like plain sight in Ltwoo's updated catalogue:

http://www.ltwoo.com/en/col.jsp?id=175

On the MTB side, there's a new 'T' series of shifters/derailleurs with clutch rear derailleurs. These are across the range, going from 8-13 speed. There's also the semi-electronic shifters as has already been shown.





For gravel, there's the new shifter shape available in 1x12, with brake calipers (as has been leaked previously). There's also a new rear derailleur with a clutch that comes over from the MTB line, but has been redesigned to take a barrel adjuster which is across the range from 9-12 speed. All other components remain the same.



On the road, the new shifters are available in a 2x12 version, with aluminium or carbon blades.



No separate brake caliper listed so I assume it's the same as the gravel one. No other new road components, and the new lever shape is only seen on the 2x12 hydraulic content, everything else remains the same.

Well...looks like I have to reconfigure the gravel build I've been budgeting for. These are exciting developments. Hoping that clutch is an actual clutch.