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https://milton.host.dartmouth.edu/reading_room/pl/intro/text...
At least through a contemporary lens I didn't get the impression it was political whatsoever. What it did seem to do was fill in the (many) blanks present in the corresponding biblical narratives.
YMMV, but I don't think that this was Milton's main message - IIRC from reading PL years ago at school, the main story was Satan's rebellion against God. Satan was presented as a sort of heroic anti-hero, who has some great lines, although he eventually (of course) loses. So, I guess I'm saying please don't let this review of a book that highlights lots of peoples' reactions to PL influence your judgement of the underlying source text.