Yes, I've read about it. It didn't make sense for LEGO not to come to an agreement with them to sell the game so LEGO can make some money so as the developer team lol.
If these fans had refused such an agreement for whatever reason they have, I would persuade them by saying "You are clearly passionate developers. With this money you can fund your next video games". It would be unrealistic for them to waste their long experience and the group dynamic they got used to, perhaps because of that they already work on their next project. Synergy of the team in video game development is very important so despite you may hire the best people in their field, lack of mutual group thinking will ruin the development of the game. But then sometimes people enjoy their time with each other so much they really don't care or don't realize how lacking the video game is way more than they actually realize. In the end they end up with thinking "despite we may go bankrupt due to poor sells what will matter is the friendship we developed here instead of actually developing the video game" lololol, but then poor sales starts blame shifting and friends become enemies, it kills the team, it can kill future of the company and franchises.
I think if video game companies had actually hired fans to help developing the video games it would be a very great idea. Instead they hire the guy who only see it as a job so he can survive. Then no wonder the game lacks soul, man.
If LEGO had refuse I would persuade them by saying, "dude you won't have to have a concern about costs to pay for the development of this fan project, but for zero-cost and relatively for free asset you can make money" lol.
Sometimes fan projects, even tiny mods, are killed because they can waste the appeal of an official video game that the company plan to develop, currently developing or try to test the waters. Then I would understand it. But then it would be shame to let this opportunity to make money for both sides go to waste. For example Nintendo doesn't seem to do anything about playable Linkle mods but then they are so aggressive for playable Zelda mods so it makes you think "Zelda game that you actually play as Zelda when?" lol.
For example after I developed a tent mod for Zelda BOTW I was so scared Nintendo would kidnap me or something. Because of this fear I just deleted the mod. No one can know if Nintendo watching me right now. Nintendo is the biggest mafia big boss of the world way dangerous than America, Russia and China combined lololol.