I disagree with you.

Interveinal chlorosis (yellowing of the area between the veins) usually has the veins remain green all the way to the leaf margins.

Although the center vein is still green, the veins in most of the leaf are yellowing.

On the lower leaf, this is yellowing pattern is usually caused by nitrogen deficiency.

Nitrogen deficiency can be caused by three things:

Lack of available N in the soil.

Solution: add some fertilizer.

Overwatering the pot causing anaerobic conditions and denitrification (conversion to NO2 gas).

Solution: allow the pot to dry out more and add fertilizer.

Salt accumulation in the pot. This can inhibit nutrient uptake from the soil by blocking the mechanism for transport.

Solution: leach the pot by 5+ gallons water through the soil and add fertilizer.