I threw this out there:
It is irrelevant that these are disciplinary laws or that they were changed. This is obvious.
The point is that CITH and girl altar boys began in disobedience. CITH was forbidden, but practiced in disobedience before Paul VI caved and allowed it. He had even previously preached against it! So did JPII although he allowed it as an "exception" (which is now the rule in practice.)
Girl altar boys were forbidden in 1980 and yet disobedient priests were allowing it, which is why JPII forbade it explicitly in the Encyclical I quoted.
Bishops did not suddenly find a "new right" to girl altar boys in Canon Law. They were obviously forbidden and their appeal to Canon Law was a charade.After years upon years of disobedience Rome finally caved, just like CITH, rather than try to discipline numerous disobedient clergy.
You are entitled to your own opinion but not your own facts.