Yes, the people who say "Lego" is the "correct" plural are also wrong according to the document they cite for that opinion. The Lego Group's material says that

Yes, the people who say "Lego" is the "correct" plural are also wrong according to the document they cite for that opinion. The Lego Group's material says that you are never to use Lego as a noun. It's always "Lego bricks", "Lego sets", "Lego minifigures", etc. Colloquially, they don't really care what you call them, plural or singular.