If you need further evidence Nintendo is being really conservative with Switch shipments...
3 million Wii Us shipped in 5 weeks at it's launch.
Even the Wii U sold out at launch still, Nintendo restocked but they couldn't keep the deluxe units in stock until months later only the basics where ever on the shelves. No one wanted a fucking basic either so not comparable, 8 GB of internal memory is laughably bad you can't even play physical XCX with the installs on it.
Which means they're shipping less Switches then Wii Us in the same time span.
Whether you want to call it a forced shortage or not, it's plain as day Nintendo is being very conservative with the shipments.