Yes, your plant's pale green color from seed and soil pH reading of 4.5–5 strongly suggest a pH issue, not a nutrient deficiency per se. At that acidic level, key nutrients like nitrogen, phosphorus, and potassium become unavailable to the plant—even if they're in the soil.
Ideal pH:
For most plants (especially vegetables and herbs), ideal soil pH is 6.0 to 7.0. Some exceptions prefer more acidic or alkaline conditions, but most will struggle at 4.5–5.