Hi there,
We automatically brotli or gzip request most suitable asset types for you if the browser requests it; no additional config required or possible. This is the case for all deploy types including drag and drop.
If you want an old page gone, deploy a new copy of the site without it - we don’t show data from older deploys on your production URL.
If you want an entire old deploy or site gone - you have to delete the site. You cannot delete individual deploys. There is a site deletion card at the bottom of the general settings page for any site.