Does it really matter what is canon regarding wood elves and what isn't? Faerûn is a setting with diversity where any character can be poly. Not all dwarves are stubborn and not all gnomes are carefree and a wood elf can be monogamous (even if the quoted wiki is canon, it simply says wood elves are often polyamorous, leaving plenty of freedom for the creator of a wood elf character to choose whatever they think fits their character). I see little to be gained by arguing whether Halsin should be poly or not because he is a wood elf, Halsin is esatablished as non-monogamous and you can have a story with him where he is just a casual fling on Tav's bucketlist of sexual conquests, or a story where you end up in a relationship with a deeper bond and commitment and this does not in any way conflict with the fact that he is non-possessive and strongly values and protects his and Tav's autonomy and independence in the relationship.
