Basically, in about July-August 2019, the contracts of the old dev team expired. After that, they did not work on the game anymore. The game received a smaller dev team, but they had problems with understanding the code. For example, they wanted to bring cosmetics back into the store at one point, however, they literally could not figure out how to do that.
Any stuff the old dev team worked on, but wasn't quite finished yet (like the new units), was very slowly worked on by the new dev team. But the new devs have not yet worked on a new unit on their own, only finishing work that has been already started.
In general, this new dev team is here to offer maintenance for the game. They make sure that the servers keep running and release a patch every 2 months or so (old dev team had a patch about every 2 weeks). But they will not release new events or similar things.
With the old dev team, the old community manager is also gone. She was actually quite active here, but after the new devs arrived, she also vanished. The new community manager didn't even know that the forum existed at one point. All he does on this forum is copy-paste the newest patch notes in here now, but don't expect him to reply to anything.
Some EA employees still operate on this forum, but they are mostly here to just keep the forum rules in order, like no name-calling or harassment, etc. Any feedback given here will not be directed to the dev team.
So why is the forum still here? Well, this forum isn't just C&C Rivals, all the other games are here as well. They can't just shut down the whole forum. It is also kept alive because maybe someone may scroll through the old posts and actually find a solution to any problem should he have any.
Again, if you really want to be heard, you should try your luck on the C&C Rivals subreddit (community manager is sometimes active there, https://www.reddit.com/r/cncrivals/ ), or try the discord server ( https://discord.com/invite/HPJfffX ).