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If I understood correctly you are asking what will happen if you delete your form from your account. Will that also delete form from your website.
If you delete form from your account and form is embedded inside of your site, your site will not have form anymore. However I saw that on Page URL you provided there is a link to your form. Upon deleting form from your account link will be visible on your site, but when user click on it link will redirect user to the error page.
Hope this will help. Let us know if you need further assistance.