I tried to highlight this in the post, but the key is a personal user one tied to an email, and the worst that I expect would happen would be that some training scripts break.
If this was a production key or something that seemed like it would cause financial harm/downtime, I would have never deleted it.
Honestly, with this level of competence I wouldn't be surprised if the same admin user credentials were used in application/lambda processor/whatever there is. Not at all saying you shouldn't have done it though!
