Thanks for providing that link but that isn’t a reliable source either or confirms anything, it’s one of them statements where this has been hearsay for quite some time, but this statement has never been confirmed. Shawn has more inside knowledge with park staff, he has said before this is “simply a rumour and never been confirmed” however we have had no source or confirmation either end.
But no one can say it’s unlikely they won’t come back as honestly none of us know and the dye was fine for years. Like mentioned before it’s just a dye that doesn’t last in colour, when exposed the dye runs out when. There are also safe dye solutions available, Different alternatives for the water to be pumped out or to spend money on a concealed system. At the end of the day the waterfalls came back on the rapids, after being off for years with many claiming they wouldn’t return.
This is another scenario for Alton towers where demand is there by enthusiast they know this is an important feature with nemeses being so iconic. They listened to us with the waterfalls, wooden rollercoaster, removing the guns and bringing back the haunted house and Sub Terror. It just depends if it’s out of there control or a simple fix that needed a passionate new team and budget. Time will tell…