Yellow Leaves - Water-stressed tomato leaves are wilted but still green. Yellowing leaves, on the other hand, are usually a sign that the tomato can't get enough oxygen or other nutrients, similar to an oxygen-starved person turning pale. The article qualifies this by saying diseases/soil deficiencies can also cause yellowing.

Root Rot/Soil borne disease - Signs of a serious infection include yellow, dark-spotted or brown leaves and slow-growing, stressed tomato plants. Crowns are soft and the roots have large brown sections that may be rotted or desiccated.

Leaf Roll - As overwatered tomato plants mature and begin to set fruit, the topmost leaves curl inward and upward. The leaves themselves are firm, rigid or crumbly.

Thoughts?

Yellow Leaves - Water-stressed tomato leaves are wilted but still green.

Initially true, but very soon the leaves turn yellow.

Yellowing leaves, on the other hand, are usually a sign that the tomato can't get enough oxygen or other nutrients,

True but what it doesn't make clear is that it is the over-watering, the high moisture level in the soil that creates the lack of oxygen and nutrients by displacing them with water.

diseases/soil deficiencies can also cause yellowing.

True but in most cases it is a very different color of yellow and the interveinal pattern of the leaves appears quite different.

Root Rot/Soil borne disease - Signs of a serious infection include yellow, dark-spotted or brown leaves and slow-growing, stressed tomato plants. Crowns are soft and the roots have large brown sections that may be rotted or desiccated.

(1) root rot is not a disease and (2) the same symptoms are not limited to soil borne diseases only as stated above. Air borne diseases can create the same symptoms.

Leaf Roll - As overwatered tomato plants mature and begin to set fruit, the topmost leaves curl inward and upward. The leaves themselves are firm, rigid or crumbly.

An oversimplification. Many things can cause "leaf roll". Physiological tomato leaf roll is a plant's response to stress and inconsistent watering/soil moisture levels (as opposed to just over-watering) is only one of the possible causes. Plus leaf roll often develops on the larger, older, lower leaves first, not the new growth. Top/new growth leaf roll is often more associated with disease than with over-watering.

JMO

Dave