Several things I would point out (not that a PIMI would care):
1. This is how you treat someone who "is called (present tense verb) a brother/sister." The fact that the announcement says that " so-and-so is no longer one of JWs" ─ Under any other circumstances anyone who isn't a JW would also not be "called a brother." At the WT Study non-JWs who answer are addressed as Mr. or Mrs. or Ms., not "Brother/Sister . . ." So it is pure hypocrisy and vindictiveness on the WT's part to treat a DFed one as if they are still "called a brother/sister."
2. No one, besides the Judicial Committee knows what the charges are against the person being DFed. But the letter (1 Cor) is addressed to "the church of God that is in Corinth." (1Co 1:2) Not to the elders in Corinth. Yet the WT ignores this and keeps the reasons for the DF secret. No one else knows what the DFing is for. Even if the person has taken some stand based on a conscience matter. They are treated the same as an adulterer or pedophile. It is pure wickedness on the WT's part to enforce things this way. They also do it this way to fend off defamation law suits. So they protect themselves against problems with DFing, but expect the R&F to accept any pain the procedure causes. Pure hypocrisy!
3. When the problem is doctrinal, the WT holds the R&F to whatever is currently in print. But the WT allows itself to depart from that. And if one was DFed for not accepting some teaching or understanding, and the WT eventually changes to the teaching the DFed one held to, then, there is no pardon for the DFed one. In reality, that one was DFed for not being obedient to the GB, not for disbelief. This also makes the WT guilty of lying. They condemned the person but lied about the real reason.