Oh yeaah, I've mentioned that port in the past. It has an apparently strange history behind it. Nintendo did release 4 games on the Nvidia Shield's Wii emulator exclusive for China... but they ran into a similar problem as the one plagueing the Chinese Switch right now. Just 4 games (Galaxy, Punch-Out, Twilight Princess, NSMBWii) on the Shield due to approval issues. While the Chinese Switch only has 11 (soon 12 I think) games officially ATM, it can play international cartridges too (just with no online support).
The Shield also was barely advertised, and the Galaxy port apparently
didn't exceed 10K. And that's another issue that plagued Nintendo's efforts in China - before Tencent came into the picture Nintendo had generally severe problems advertising their console releases. And thus they
generally saw low sales.
The Shield's failure is probably a main reason why Nintendo decided to partner with Tencent: Tencent has the sheer reach (and the expertise navigating the outright byzantine Chinese approval system) Nintendo needs, Nintendo meanwhile has the console expertise (and more unique games, see Ring Fit) that the Penguin Factory lacks.
That said, this part of the article might be of interest too:
But yes, the underclocking is a main problem that they would have to solve. The Shield emulation was designed for higher-end PCs (apparently, obviously having no first hand experience myself), and the Switch port / emulation would neccessarily have to be adjusted to compensante for the much less powerful console. I'm not a software engineer myself, but some of those issues might be allieviated with porting (although porting probably introduces some issues of its own).
(I regret nothing!)