Greasy Fork is available in English.
あるツイートに「いいね」や「リツイート」をしたTwitterユーザー全員をブロックまたはミュートする機能を追加する
< Twitter Block With Loveについてのフィードバック
It was updated today and works again
The userscript is working again thanks to @nwxz. You can update to the latest version and check if it's fixed for you.
Hasn't worked for at least two weeks now, and I can't find a working alternative anywhere... sigh.