Of course MCAS was disclosed to pilots, the idea that it wasn’t is ridiculous to the point of absurdity.

Boeing has gone off the rails, but the general lack of nuance in the common narrative about their failures is really over the top.

MCAS is how a fundamentally different plane behaves (in most cases) like a normal 737. The fact that such a system exists is described, and disclosed, in minute detail to pilots when they get their mandatory training on the 737-MAX.

The specific name wasn’t used in the training, and that’s where this ridiculous narrative came from.