As to the use of “Churches” as opposed to “ecclesial communities”, yes, I’m familiar with the distinction.
But I’m reading this differently. The Eastern (and other Churches possessing apostolic succession/valid orders) case is given in para 3. No mention of the need for referring to a bishop, no mention of near death. It states that “Catholic ministers administer the sacraments of penance, Eucharist, and anointing of the sick licitly to members of Eastern Churches which do not have full communion with the Catholic Church if they seek such on their own accord and are properly disposed”. And that’s all I read as required in such cases.Two stipulations, and the Catholic ministers communicate those Eastern Orthodox (and others so situated).
Para 4 seems to addressing a further situation. It does not mention Churches, but says that “Catholic ministers administer these same sacraments licitly also to other Christians not having full communion with the Catholic Church, who cannot approach a minister of their own community and who seek such on their own accord, provided that they manifest Catholic faith in respect to these sacraments and are properly disposed.”
The wording suggests that is not referring to the Eastern Churches, covered in para 3, but specifically to the same sacraments, to other Christians (not specified, but other than the Churches just mentioned), in case of near death or other grave circumstances, requires reference to a higher (episcopal) authority, for approval, refers to a community, not a Church, with the two further stipulations. I conclude that the two paras refer to two situations. Para 3 says merely that an Eastern Catholic (or similar situated) may receive. Para 4 addresses other communities, and sets the bar higher. But it does not limit such to near death circumstances, or address Churches (in the sense the distinction is made), but other Christians and communities.
So I read it.
GKC