Holy shit! My time as a wii homebrew developer to shine haha.
SO, this is half myth half suspicion. On the wii, nintendo was able to update a part of the booting process called "boot2". Boot2 can be considered like a kind of early program running while the system boots ( think of the windows logo you look at when booting your pc ).
The group of people who made the tools/programs that made it possible to run homebrew on the wii, called team twiizers or fail0verflow, said the code used to update that part of the system was unsafe and could brick wiis. Personally, i havent seen that code yet to verify, but i degress.
People read that, and took it as boot2 update == brick.
Come the wii's 4.2 update ( i think it was 4.2 ), nintendo pushed a boot2 update (boot2v4) and it would install when the wii connected to the internet and checked for updates. This made people scared that it would brick, which resulted in what you think off.
Personally, i havent heard of any brick stories by the update ( besides people doing weird ass, unsafe, shit ). But without seeing the actual code from nintendo, it is possible i guess
But with that "reward" program its rather suspiscious to do such program. And generally in times like today, where every company wants to brick old game consoles to force them to play the more locked up newer console. But lets hope nintendos intension isnt that.
I love f4mi's videos. They're an absolute treasure and she's clearly passionate about the Wii/DS era of gaming which was my own awakening point for modding the absolute christ out of every bit of tech I can get my hands on.