Did you read through the previous posts before posting? (You should do, always). Because some share a link to commands you can use alongside the trainer. Subnautica - Console Command Cheats.
Trainers are updated based on current real-time popularity in the community. Subnautica is an older game that was released in 2014, so its playerbase (and therefore the amount of WeModders actively playing the game) isn’t as strong as it used to be. Despite the fact it is an open world game with base building, its replayability factor is rather low compared to many other open world games, because there’s only one story branch, and there is nothing new to discover. It’s a great game, but gets old fast after the first complete playthrough. So sadly it probably doesn’t have an active enough playerbase to be at the top of WeMod’s update list.