On the free plan, deleted Pods do count towards your free Pod limit.
For example - If you'd made 10 Pods, and deleted 5 Pods - your usage would still show that you've created 10 Pods towards your free Pod limit.
With this, we'd recommend that you update the design of Pods, instead of deleting them in the free plan.
Deleted Pods do not count towards your usage in the Paid plan - as this is unlimited.