Is this nute burn / deficiency? Or light burn? Or both?

Hi buddy, that's a clear cut case of PH. It's way too high and the swings must be huge too. Whatever you are feeding it's PH isn't even close to the water feeds that follow it, that's what's causing your mix match of probs and the shading inbetween is swings or 2 high a PH, but I'd put it down to a more unstable PH with massive swings in feeds. You need to lower your PH to 5.8-6.3max and your follow up water feeds/flushes need to be the same. Good luck pal.