I agree because the examples are very clear and they do respond to the question. I found another reference to "LEGO" on the same matter, pluralized or not, and the conclusion was that it's up to you to do it or not, though they mainly referred to it as being mainly an adjective, not a noun. Obviously, it should not be pluralized as an adjective, not as a proper noun -the brand's name-but it can be pluralized as a common noun. I mean, when it denotes units of the brand, just like this article explains. However, it is important to notice that it should be capitalized, which is not the case with common nouns.