Id est adverb – That is to say; in other words. Strictly speaking and id est are semantically related In some cases you can use "Strictly speaking" instead an adverb phrase "Id est".
Strictly speaking adverb – In actual fact. Id est and strictly speaking are semantically related in namely topic. You can use "Id est" instead an adverb phrase "Strictly speaking", if it concerns topics such as that is to say.