There was a twitter thread from an IP lawyer in the article. The suing fashion designer was only talking to Lego customer service about his issues, who (seemingly by mistake) said they could send him a set?
It doesn't seem like this is gonna go anywhere, its hard to tell if Netflix or Lego is at fault for not clearing the rights (also mentioned that this jacket was used on the show without clearing rights from the designer) but from this thread it seems like there isn't enough similarities between the jackets in the first case. So they might not have much of a case.