Clearing old Google results boils down to one question: do you control the...

https://wiki-zine.win/index.php/What_Should_I_Do_If_Google_Shows_the_Wrong_Snippet_for_Your_Homepage%3F

Clearing old Google results boils down to one question: do you control the site? If it’s your site, delete the page and ensure it returns a proper 404 error; don't leave it as a soft 404 or Google will keep it indexed