In the other article, it said the sick twin had a very severe heart defect that would require multiple surgeries and he still might not survive. I don’t think TTTS causes heart defects? And a heart defect doesn’t put the other twin at risk.
And even if TTTS were the problem here, at 32 weeks, you can just deliver both babies.
It definitely can cause heart defects, but you are right about delivering both at 32 weeks.