I think the intended meaning was that the rest of those 32 countries don't sentence people to capital punishment for drug crimes.

No, they do, that's why they're on the list.

Most of those entries are even explained with a link.

As I understood it they're on the list because their laws permit capital punishment for drug crimes. The article is saying that only 6 of them routinely exercise that possibility. I read through the notes next to the countries, but didn't find anything interesting.