If I understand correctly, Immensea was a modification granted by request rather than Memmoriale being a stand alone document suffering from nefariously exploited “loopholes.”
I have to question the integrity of someone trumpeting a document they like, and ignoring a subsequent modification they don’t.
I don't think that is the case. Just read chapter 4 of IC -- where is a modification? All it does is clarify conditions under which communion in hand may be locally permitted.