Let's get this out of the way: the advantage from the bond trading algorithm doesn't come from a quantum advantage.
It either comes from (non-reproducible) luck or a better algorithm, and not something you wouldn't be able to do classically.
“Working with a team from IBM, HSBC leveraged an approach that utilised quantum and classical computing resources to deliver up to a 34 percent improvement in predicting how likely a trade would be filled at a quoted price"
