I also know nothing about any renaming in the genus Angreacum.

What I often see is Angraecum bancoense and distichum being confused,
bancoense has sligthly smaller flowers - but beside from that they look
pretty much the same, and when out of flower I have a hard time telling
them apart.

Another species that sometimes gets labeled as Angraecum distichum is
Microsaccus griffithii, grifftithii does look a lot like distichum (if
you dont know any better), however, it is a smaller plant and flowers
usually in pairs (which "mirrors" each other).

Charles, it would be good to know what you were told more exactly, any
reclassification would be interesting to investigate, but I also have
not heard of such a thing... could you ask them nexxt time you see
them, and let us know what they were talking about?