Ahem. I believe you are referring to this request, made by the ADL to the Icelandic Ministry for Foreign Affairs, that the Minister take action to shut down the hosting of a website

mapping and publishing addresses of Jewish individuals and institutions [in Boston] and calling for these individuals and institutions to be “dismantled” and “disrupted”

which had recently migrated to a hosting service based in Iceland. Its anonymous “anti-Zionist” creators state that they

have shown physical addresses, named officers and leaders, and mapped connections. These entities exist in the physical world and can be disrupted in the physical world. We hope people will use our map to help figure out how to push back effectively.

So I’m not really sure what you mean in terms of “precedent”. Telling people that anti-Semitic material being hosted on servers inside a country is being hosted on servers inside a country is not a false accusation of anything.

https://www.adl.org/resources/letter/adl-letter-icelands-minister-foreign-affairs-regarding-mapping-project

https://www.adl.org/boston-mapping-project