LEGO knew this set would generate a lot of free publicity and sell really well!
This doesn’t hold up for me for a couple of reasons:
If LEGO was prepared for an onslaught of media attention on this set, they sure didn’t show it. LEGO didn’t have images or a press release ready to go at the start of the Toy Fair, which is why you just see the same few images in all the news articles.
LEGO had no reason to believe adding a wheelchair to a set would automatically make a set sell.