Even in 1952 they couldn't accept the fact that some Bible Students saw Rutherford's power grab and left the WT, and branded these dissidents the Evil Slave when in fact the Evil one was Joe Rutherford and his conspiratorial cronies.
Now they try to hide the fact saying the Evil Slave is just a literary construct and not part of a prophecy. It was never a prophecy, it was a parable, an illustration.
The WT can't have it both ways, either the Evil Slave is a real thing or It's not. Frankly, the WT hierarchy acts like the Evil Slave in the parable, plain and simple.