Glad to have you back, @thebake.

I appreciate you providing the outcome of the steps that you've tried with deleting bank accounts in QuickBooks Online. This information will definitely help other users. 

Also, for other users' reference, I'd like to add a link that will provide the instructions about disabling the automatic download of the transactions that needs to be deleted. 

Don't hesitate to post again if you have any queries with QuickBooks or insights that you might want to share. It'd be my pleasure to assist you. Wishing you and your business continued success!