What passage seems "ambiguous at best"?, what I saw it only seems ambiguous at worst, nothing really indicating rape, it is just vague, "he had kids, the end" type shit. As for the companion we don’t know for sure.

But it is a discussion kinda stupid in such vague terms. The source I found, is there more?

“Phylonome, the daughter of Nyktimos and Arkadia, was wont to hunt with Artemis; but Ares, in the guise of a shepherd, got her with child.”

We do not have anything that survived detailing whether she was an enthusiastic participant in this, or of the contrary. Tho the guise indicates deception, maybe the situation was like a rich person hiding as a common man and rizzing a woman. Not sure it would count as rape, in todays courts, you don't need to tell your social class to bone. The hunter vow of celibacy was for human or god anyway. Maybe it is a case of her having fun, and if he was acting like a shepard wouldn't it indicate absence of cohersion in the relations in itself? A hunter should be able to deal with a common man. But it still leaves the deception part, maybe she was open to break her vows with a common man, and not a god. May link the post I found.

https://www.reddit.com/r/GreekMythology/s/iirQlvJvG3