Unfortunately, I've just found a copy-paste mistake:

Quote Originally Posted by Боб Уайтман View Post
If the stress is on the ending, then we have a dictionary form which ends in "-кой", "-гой" or "-хой".
This part is correct.

Quote Originally Posted by Боб Уайтман View Post
If the stress is on the ending, then we have a dictionary form which ends in "-кий", "-гий" or "-хий".
It's a mistake. Should read as

If the stress is not on the ending, then we have a dictionary form which ends in "-кий", "-гий" or "-хий".