Hi there,
Thanks for contacting WPML support, I will be glad to help you.
To unregister WPML on any site you need to click the "Click Unregister WPML from this site" link in Plugins > Add new > Commercial tab. Then delete the site key from your WPML account.
But since you don't have access to those sites, you can delete the keys directly from your account here https://wpml.org/account/sites/
I can't do it on that way cause it's staging versions and we deleted these websites so there is no any way to get access to wp-admin if the website does not exist anymore.
Who can delete them from my website list on WPML?
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