https://www.singaporeair.com/saa/en_...s.jsp#Header13
Haha its been right there the whole time.
I somehow kept missing it as all the links kept taking me to the "enhancements page"
However: it says no fee unless "routing changes"
Would going from a Sin-NRT flight (with stop in BKK) to a SIn-NRT (nonstop) qualify as a routing change or not?