Unfortunately, you cannot remove the text from the default Universal Login Page. You only have the option to modify the Login Text Prompt by making a call to the Auth0 Management API’s /api/v2/prompts/{prompt}/custom-text/{language} endpoint.
And even when trying to modify the text with an empty array, this will only revert the text to default:
{ "login": { "description": "" } }
In this case, I recommend you to consider switching on the Customize Login Page toggle in your Auth0 Dashboard>Branding>Universal Login in the Login Tab. Doing so should give you complete control over the look and feel of your Universal Login Page.