It’s a valid opinion, Armand being agender and androgynous…

[^X so this is IWTV!Denis bc I admit that as much as I adore Antonio’s Armand for my own reasons, Denis looked more like canon Armand right down to the impassive expression.]

We have to look at those words first. “Because the language of gender is still evolving, a lack of consensus on terms and definitions means it is up to the individual person to decide how to define themselves.” [X] My personal understanding of ‘agender’ is someone who is neither masculine nor feminine internally, and, to a variable extent, neither masculine nor feminine externally, either. A lack of the gender binary altogether.

‘Androgynous,’ however, I understand as being “partly male and partly female in appearance.” – more external. I see ‘androgynous’ as someone who may be perceived as both externally, or able to pass for either gender to a variable extent.

In TVA, David tells Armand “You’re sweet, boylike and pretty as a girl.” Mortal Armand is amused that potential buyers thought he was a girl, but then it pisses him off when Allesandra admires his beauty: “ ‘…a fairy’s child planted by moonlight in a milkmaid’s cradle to thrall the
world with his girlish gaze and manly whisper.’ Her flattery enraged me…”

So #your headcanon may vary, but I headcanon Armand as being capable of passing as a girl (and sometimes pushing at that envelope for his own purposes), but he’s very satisfied in his own masculinity. It doesn’t seem to be something he ever addressed or was ever confused about in canon, other than the fact that sometimes it angers him when he’s perceived as feminine, and at other times, he’s used it to his advantage. 

^I guess that counts as Armand being androgynous, but not agender.