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Thanks for the detailed description.
First of all, when you update the subnets, the ALB nodes (ENIs) are replaced with new nodes in new subnets. Replaced node that has been removed from service will first be removed from DNS so that new traffic will not be sent to it. Then it will enter a grace period waiting for traffic to drain, and existing requests to be completed, after which it will be shutdown. That said, if your clients continue to send requests to the replaced nodes (e.g. through a long-lived connection), the node takes longer time to be drained.
Stickiness setting on the other hand is to make sure any ALB node forwards to the same target or target group, which does not contribute to the current observation.
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the ENI with old ip is gone. It almost exactly 7 days from deleting the old subnet. Not sure it is because the stickiness settings or my other approaches today.