Hi Bruno, For some years I've been in the habit of using indefinite singular "they" when I'm not certain what pronouns a given person uses and when that also isn't directly relevant to the conversation; this is distinct from its use by non-binary and other people who use it as a definite pronoun referring to themselves individually. I've found that this habit works well as a first approximation among the people I spend most of my time talking with, and has a lower rate of people telling me I got it wrong than when I try to guess, so I don't plan to change my default use of language here.
However, I'm sorry I got it wrong in this case. When somebody has told me what pronouns they use then I always try to use those instead of a placeholder, so I will of course refer to you using "he" etc. pronouns in future. Regards, -- Colin Watson (he/him) [cjwat...@debian.org]