For context, for those who do not know (maybe you do know, but not everyone does).

The European Union is a thing.

The Council of Europe is another thing.

Both organizations are groups of countries in Europe (which is just a geographical area), but they are not the same organization.

In practice, no country has ever joined the EU without first belonging to the Council of Europe.

The European Court of Human Rights is not an entity of the EU. The ECHR is an institution of the Council of Europe.

Chat Control is a EU thing.