I don't think its nute burn based on how high the damage is on your plant. I believe nute burn would burn your plant from the bottom up, and I noticed your top was damage, yet some lower nodes weren't. If you flush and it gets worst, try adding more nitrogen brother. Til then later!
I think you might have this a little mixed up.
Deficiencies in mobile nutrients work their way from bottom up. If the plant is low on nitrogen for example, especially when in the vegetative state, it needs it most at the top of the plant where the new growth is. Nitrogen being a mobile element in cannabis is then drawn from the lower foliage where it is LEAST needed, and transferred to the top of the plant where it is MOST needed.
Nute burn tends to happen first where the newer growth is.
So burn - new growth first. Deficiency - old growth first. (at least when it comes to mobile nutrients).