The LAPSUS$ post suggests that they queried the AWS keys out of Slack. So the support engineers just have access to Slack, and Okta engineers were dumb enough to put those keys in Slack.
The reason I think that is because if they really had keys for production machines it seems very unlikely they wouldn't have used them to produce some more damaging collateral than they've presented.
We get alerts when folks are sharing tutorial code with fake keys like DEADBEEF in them. It's nice to know DPL works, if you use it.