Banks hedge investments-it's pretty standard and lowers their risk-weighted assets. If their investments are big, their hedges are big. If banks have a net negative view towards their AI investments, this article fails to articulate that (regardless of how many exciting adjectives they choose to use).
I think you're filling in the blanks for a pretty detail light-broad brush-click baity article. The $5 trillion that it cites is by its own words what they're "expected to spend". Also the global bond market is trillions of dollars worth and yes it is typically hedged.