It has been confirmed, by the BBC. Also the local Tory council leader stated that the residents did not want the inconvenience of having a sprinkler system fitted.
Part of the problem with sprinkler systems in tower blocks is that you cannot pump the water up very high (as I understand it the current limit is 15 floors). This means that you would have to have storage tanks at various levels (say, every five floors), with pumping systems linking them together. You would then have to pump water up to the first set of storage tanks, then, when this set is full, pump the contents up to the next set of tanks, and so on. Such tanks would have to be large (no point in having tanks with 1 minute of sprinkler activity in their zone), and all of this would take up space, for the tanks, the support structures, and the pipework and pumps.
It has been said that you cannot put a value on a human life. Unfortunately this is not the case. At the risk of being flamed for this paragraph, society has to accept there will always be times when it has to choose what is an acceptable risk, and then manage that risk properly. As we grow up we learn what things can hurt us, and then we do not repeat that experience (such as touching a hot iron to see what it feels like). It may be possible to build a completely safe dwelling (where it would not even be possible to stub a toe), but that dwelling would be prohibitively expensive.
What HAS to happen is for there to be a proper and impartial investigation of all that has happened at Grenfell Tower (including the refurbishment and the materials used), clear and acceptable recommendations to be made, and for them to be acted upon (I am not going to discuss apportioning blame or imprisoning people). After the Ronan Point tower block incident the building regulations were reviewed and updated, and this HAS saved lives. If things had stayed as they were, every time there was a fire in a tower block there would have been a risk of partial or full collapse. However, the building regulations were updated in 1971, and now tower blocks do not collapse (look at Grenfell Tower; days after the inferno it is STILL fully upright; unsafe in some areas, which requires shoring up, but it has not collapsed).