I don’t think there is any rule prohibiting manufacturers from promoting products in the forum, just always a good idea to be as transparent as possible. People come here to learn about new things including new products.
My only word of caution would be to remember it is an open forum so you never know where things might go, so you just have to be transparent and prepared at all times to avoid things backfiring.
be helpful and courteous and to encourage the same in others
Common sense but very good advice!