If anything, it is probably a good idea to keep accounts open for the next few weeks and check on them periodically to see if the content restores on its own. If it does, you can then proceed to use the delete suite of your choice and run it again.
I suppose that once you are fully confident in deleting your account, you can do so. Alternatively, it might be better to keep the accounts open but delete all the content at this point.
I cannot attest to whether this product is BIFL or not, as we have only had it for about a year. However, this Ninja has been fantastic and works really well for everyone in the house who uses it. It’s used daily and is still going strong.