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When you say it doesn't exist - you mean it was deleted somehow outside of Pulumi? If so, you can

pulumi state delete 'urn:pulumi:basic-web-kenny::basic-web::awsinfra:x:ecs:Cluster$aws:ecs/cluster:Cluster::app'

to remove it from Pulumi's state so that Pulumi doesn't try to delete it again. That said - the error message you are seeing sounds surprising if that is the case. Are you sure the cluster does not exist in AWS anymore?

Can't recall how it was deleted but am 100% certain it does not exist anymore.

Okay - then

pulumi state delete

should help here.

Also, a bit annoying - when I run

pulumi destroy

on this stack, it stays on this UI for 10 minutes:

Type                 Name                       Status       
     pulumi:pulumi:Stack  basic-web-basic-web-kenny               
 -   └─ aws:ecs:Cluster   app                        deleting

Seems like it could exit a lot earlier.

Yes - I believe it retries for 10 minutes. This is unfortunate, but I think there are cases where it can take several minutes to delete successfully even under "normal" conditions.

That makes sense. Though if the resource does not exist, I don't think it would change after 10 mins.