If any of my former JW associates labelled me as "an apostate," I'd ask them to explain to me exactly what they think an apostate is - not what the org tells them it means.*
"Heresy,
denial or doubt of any defined doctrine, is sharply distinguished
from apostasy, which denotes deliberate abandonment of the Christian
faith itself."
Many people abandon the denomination/org/sect of JW's, but not Christianity.
Christianity & the org are not one and the same!
*Likewise with the word "Christendom." ("Christian people or countries as a whole" - https://dictionary.cambridge.org/dictionary/english/christendom)