Did they also do a mass buy back deal for used copies at near MSRP right before they did it? I'd like to see some actual evidence for even a single one of these "falling in line with every reprinted title they've sold in the past".
Think about it, back when they did the mass trade in deal at $50, their price for used copies wasn't even near $90. That price change happened only very recently. If they really wanted to take advantage of this pricing and were planning it, they would've have held onto all those copies bought at $50, wait until there's sufficient stock/trade-ins slow down, and then up the price to $90 before setting them all out at once for sale (which is most likely what you're seeing here). They wouldn't be buying at $50 and turning around putting them back on shelves at $60 or whatever the previous inflated price was.
Since GS is THE exclusive retailer for this game, Nintendo would be completely aware of this if it as well, wondering why newly shipped copies are still not showing up. An official reprint would most likely see stock coming back on Nintendo's store too.
You're all wearing tin foil hats I swear.