Yes, as far as I'm concerned, it's fine to post any écriture to the écriture club. That's what it's here for, in part. I suppose I should say that there is also the
link club, which was created after the écriture club as a catch-all for all creative output (not just écriture but also illustration, singing, dance, painting, crafts, etc). In practice, I see that users tend to post plus poésie in that club and post their prose here. But it's perfectly appropriate to have your poésie in either (or both!) clubs. I like to think you're plus likely to get constructive feedback in this club, and plus likely to get uncritical reaction in the other.