it's still pretty meaningless in practical terms

the project that got closest to aiming for a socialist transition was bolivia (i'm saying "was" because afaik they've been dealing some internal dissent within MAS since the coup, which has actually been hurting linera, their most important marxist and the most vocal one about the idea of transition)

chávez by the end of his life was actually becoming a revolutionary given the changes in discourse in the early 2010s, but he never managed to do anything more than a modest social democratic plan

lula is a soclib centrist, so was rafael correa; bachelet was to the right of them, she's basically chile's warren if i'm being very generous

corbyn shouldn't really be trusted in this, he has called even lula a socialist before, which is a joke at best as he's an austerity lib who likes food stamps and public universities (which is good, even great for me personally as because of him i'm finally getting a cool undergrad scholarship, but it's still just lib shit)

so yea the label doesn't really work when it's associated with these vastly different leaders