this was always going to happen.
remember how this started out? Labor said "we're going to build this fabbo network", Abbot then immediately countered (without talking to anyone who had a clue) with "that's a bad plan, because, Labor bad".
from that point on, Turnbull was painted into a corner. I think it's pretty clear that to him, the concept of FTTP (implementation notwithstanding) was always going to be the preferable solution - but due to Australian politics he couldn't immediately come out & say that - he had to support the party line or else end up not being in any position to change it.
Instead he has been slowly slowly manoeuvring away from the original "NBN bad" towards one where universal broadband is acceptable. eventually once the coalition won government, he was able to implement "a review", which is often political-speak for "make it look like we're going to make sweeping changes, but instead take the heat off for a bit, while we work out a way to do the thing that we know is right, but that we have previously argued against for no good reason".
his recent comments hint that he's confident that they've found some technical loophole that allows fttp in a way that is "better" than the previous proposal - or at least a way to package it in enough gobbledigook to make it seem that way to the mainstream.
the next phase will be the announcement of the review's findings, indicating that there will be mostly fttp possible due to something special that the Labor govt "ignored", or something like that.
Australian politics as normal - at least Turnbull seems interested in the subject.