No, that's a media/journalist thing, companies themselves can do whatever. As far as I could tell (I worked at A(RM|rm) at the time, but not on this, no particular inside knowledge or anything) it may as well just have been to get people to stop saying 'ay-ar-em', since it was already not an acronym as said up thread; just a branding change, font change. In fact to your point in particular no you can tell it's not that, because note the 'a' is also lower case in the logo and anything styled.
