one or the other, usually low light I would say but IDK what your light levels are.
charts are guidelines, you can go by the chart if you want. I'm just saying what i know, sulfur is a trace nutrient and is very common in tap water and other sources its less likely to be the cause then say magnesium which is a much more common deficiency. And I disagree with the chart on it effecting old growth.
you should have a nitrate test kit and its fairly easy to rule out nitrate.
it is really shooting in the dark to offer advice here, unless you have like a autobiography of your tank to look at. Local water report, tank age, substrate, lighting, nutrients added, water changed, whatever tank parameters you know, stocking, plant species, ect. Looking at symptoms is a start but best not to rely on that alone.