I haven't used those reddits, and I don't have a reddit account anyway.

I think the fact it occurred to you to ask, suggests an answer. If you would feel safer testing the water with a different account, then I'd recommend you do that.

People have an annoying habit of attributing expressed thoughts to a person long after the person has openly changed their mind, as well as misunderstanding the intended meaning of a stated view anyway. Same if the person was just constructing an argument for the purpose of thinking things through (for example as in devil's advocate).

Personally, I would also recommend a "listen first" approach.