Possibility is not a forecast
A money exploit depends on a specific interaction: rewards, inventory, persistence or another system. Without an observed failure, naming those categories is only a hypothesis.
Why old instructions do not carry over
A GTA Online method can depend on a particular property, mission, save rule or transaction sequence. Even if GTA 6 has a similar-looking feature, its underlying behavior can differ.
What would make a prediction useful
A report should move from a general expectation to a documented mechanism, with a platform, build, steps and repeated result. Until then it belongs in the unconfirmed category.
What this means for launch preparation
Prepare to evaluate claims rather than relying on a promised exploit. Keep intended earning methods separate from unintended behavior, and do not make purchase decisions around assumed unlimited money.