||There is irony there only if you equate commerce with capitalism. This might seem little pedantic, but even a communist system requires some mechanism for the distribution of goods and services (or "redistribution," if you prefer).
There is no good reason that a communist redistribution system should not employ a scrip referred to as "money," that exchanges should not be referred to as "sales," that the workings of the system as a whole should not be referred to as "commerce," and the system itself as an "economy."
Not that it matters, really. Communism is an impossible dream, not a real or workable system of government.