I think the SW connection, either Anakin's children being adopted away separately or Leia hiding baby Ben's existence, would be the "secret baby" trope, with more than a whiff of "lost heir". The eventual revelation about the child or children would be mindfuck-level startling, as it indeed was in Empire Strikes Back. Fans were goggling for *months*.
However, unless there's some extended Orwellian re-writing of events after that ("Weren't you there when we presented Ben to the Council?" when that never happened, say) for either a public or private audience, it's not gaslighting (as defined by the 1944 movie), but rather a Surprise Reveal.