I feel like you just answered your own question. It's a small cameo and it's not common knowledge, most people are completely unaware. This controversy has very little to actually do with them and making any kind of statements will cause unnecessary aftermaths that I'm sure a fledgling team of less than 10 would not like to endure.
Did I? It wasn't common knowledge BEFORE the game was imminently coming out, but now it increasingly is. I found out from the initial thread pointing it out here, the GameXplain video the thread pointed to, and now there is a Polygon article about it, and this subsequent active thread we are posting in now. A statement would be damage control for what is now rapidly spreading knowledge of this, but my question was why they wouldn't have prevented this stain on their game from ever becoming a blip on the radar to begin with.
Playtonic set a good precedent, they did the sensible thing and correct me if I'm wrong but I recall the reaction was by and large very positive. All backlash in that case was pretty pathetic and laughable. GfB not following in their example in this extremely similar circumstance raises an eyebrow as far up as I can physically muster.