It is often very difficult to get wording exactly right, and you are the first people to challenge it. Note how I resisted the temptation to suggest someone gets a life.
Technically I am sure you are both right, but it means what you expect it to mean: you may not change the range of the weak twos, or only play one major, or play no strong options, or play three or four strong options. But you may certainly play the strong options in all the ways suggested.
However, I can be picky too!
The word licensing has not been in use as far as allowing conventions since 1998.