Yeah, whereas the first game was met with a great deal of skepticism and distaste at first, this one is releasing as the sequel to a widely liked and respected game, plus to a much larger Switch base, probably well over 100 million by the time it comes out.
You guys are wrong. The skepticism and distaste only concerned the idea of a Mario and Rabbids crossover developed by Ubisoft, but all that was washed away by the first presentation of the actual game at E3 2017. The game's August 2017 launch didn't face any kind of uphill battle anymore, because the product itself had already convinced people.
A sequel launching on a bigger installed base is an advantage for better sales nonetheless, but let's not pretend that the first game had to pull off a miraculous turnaround.