What follows is a generic message to send to users who report Twitter profiles reproduced by a BirdsiteLive instance. The #kolektivamod team has received quite a few such reports in recent days. I expect we will continue to receive such reports until/unless Twitter finally crashes and burns.
Other #fediadmin friends: feel free to use or adapt this message for your own purposes.
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The profile you reported is on a BirdsiteLive instance - perhaps beta.birdsite.live, the flagship instance, or otherwise a version of the same program/software deployed at a different web address.
BirdsiteLIVE is a useful tool that reproduces the content of any Twitter profile in a format that is readable on a Mastodon instance like Kolektiva.social; it is a useful tool for browsing Twitter without directly providing personal metadata to Elon Musk's company. In this way, it is similar to Nitter. See the GitHub, e.g. the site that hosts and explains the code, which is open-source: https://github.com/NicolasConstant/BirdsiteLive
If you reported an account for "impersonation", this is not the case; it's similar to saying your website is meant to be viewed in Chrome, and it's being impersonated when it's being viewed in Firefox.
If you reported an account because of its noxious ideology, please be aware that the account is actually hosted on Twitter, and that the reason you came across it is probably because you, or someone in your network, looked it up. Since there are valid reasons to look up what fascists are saying - for instance, as a form of research - there is typically no reason for Kolektiva.social to take action. You may consider, however, blocking beta.birdsite.live as a domain or blocking/reporting accounts that boost noxious content from (effectively) Twitter.