Oddly, the writer used "he" in "they determined he had Stage 2 bladder cancer" because they had already used the plural "they" in the same clause – showing that

Oddly, the writer used "he" in "they determined he had Stage 2 bladder cancer" because they had already used the plural "they" in the same clause – showing that they know how confusing the singular "they" can be. Sometimes ツ