No, don't need anything extra, `extra/yt-dlp` works perfectly fine and is enough. You'll get a warning if you run it without the flag:

    WARNING: [youtube] [jsc] Remote components challenge solver script (deno) and NPM package (deno) were skipped. These may be required to solve JS challenges. You can enable these downloads with  --remote-components ejs:github  (recommended) or  --remote-components ejs:npm , respectively. For more information and alternatives, refer to  https://github.com/yt-dlp/yt-dlp/wiki/EJS

Edit: Maybe I misunderstood, now when I re-read your post. You meant it'll prevent the automatic download at runtime perhaps? That sounds about right if so.

Yes exactly, if you install the package you don't need the download the solver on the fly. AT least that's my understanding of what the package is supposed to do. Personally I have no need for it.