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小手部は、中段の構えの右小手（左手前の左小手）および中段以外の構えなどのときの左小手また は右小手。

I think one point may be a little unclear in the English translation. I would translate it as:
The opponent's right kote is a target when they are in chudan no kamae (their left if they are holding the shinai with the left hand in front). At other times, such as when they are in kamae other than chudan, both the left and right kote are targets. The point that appears to be missing from the official translation is 中段以外の構えなどのとき - "at other times, such as when they are in kamae other than chudan." The Japanese reads a little more fuzzily to me than the English translation.

However I've only been doing kendo for a very short time, and of course have no shinpan experience, so please take what I say here with a pinch of salt.