@Eagle2020 The reply provided by @expired was ‘proper’ and is also ‘accurate’.
Something else you may not be aware of is that Netlify delete deployments after 90 days:
https://docs.netlify.com/site-deploys/manage-deploys/#automatic-deploy-deletion
By default, Netlify will delete deploys after 90 days. Netlify will not delete the deploy currently published to your site (also called the published deploy), or the most recent successful deploy from a Git branch.
If the specific deploy permalink was not fthe ‘published’ deployment or the most recent, then it’s gone.