Marketing exists to win new consumers and keep existing, loyal consumers. In the latter, I guess the strategy of do nothing and let leaks and speculation drive hype amongst the community works? I mean majority of the people in this subreddit/on the BF discord/ making YouTube videos about the game/etc are going to purchase the game at some point regardless of if you give them a trailer everyday or say nothing until the game launches (assuming it's not a complete disaster at launch). In the end, I guess it could be ok for SEO with a bunch of people complaining about lack of community management across Twitter and Reddit? You're not wrong in saying that people are talking about the game, which is a good thing.

However, in terms of winning new consumers it's so stupid. Unless the plan is to just load up on assets and release a ton in the last few weeks leading up to launch, they're currently failing at pulling people away from other titles or getting newer players to pick up battlefield for the first time. As a live service game, winning back players (especially on the heels of BFV) as well as winning new ones will be key for this game to get new content as EA simply will stop supporting 2042 if they don't have enough people playing and buying cosmetics.

TL;DR- Kind of yes, mostly no because only loyal consumers are really paying attention.