That’s just a straightforward description of changes in the DSM. “Alcoholism” was split into “alcohol abuse” and “alcohol dependence” back in the 80’s, but in the intervening years the consensus view settled on treating these as separate symptoms of a single disorder. This is reflected in the DSM-5, which uses the term “alcohol use disorder”. The purpose of the linked article is to ensure practitioners are using consistent terms when communicating in a professional context.

Further context: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2701140/