iOSでは実現不可能だからやね
文句はAppleへ
https://Adguard.com/kb/ja/general/ad-filtering/create-own-filters/#removeparam-modifier
> Rules with $removeparam modifier are supported by AdGuard for Windows, AdGuard for Mac, AdGuard for Android, and AdGuard for Linux with CoreLibs v1.7 or later, and AdGuard Browser Extension v3.6 or later.