It's a very poor article that lacks objectivity. Instead it runs with the usual "games are more expensive and it's all Nintendo's fault" story. Something that the Eurogamer article they cite is also guilty of.
If objectivity was applied, such an article would cite examples where third parties applied price hikes with no justifiable reason whatsoever, but such examples are conveniently omitted to put the blame solely on Nintendo. It's a display of lacking critical thinking, so yet another example why gaming journalism isn't proper journalism, because it opts to more or less copy-paste faulty reasoning that was posted by other gaming websites before.
If pressing cards of a different physical size than the norm would be expensive, then that should have hampered DS game prices and especially 3DS game prices too (3DS cards come in an odd form that makes them impossible to insert in a DS console). Similarly, GameCube games should have been more expensive because the console didn't use the DVD format, but GC games didn't cost more than PS2 and Xbox games.
The kind of nonsensical reasoning in relation to Switch game cards stems from the fact that gaming websites do not want to accept the line of thinking that in most cases it could be as simple as third parties trying to screw over gamers. Those same third parties who try every trick in the books to nickel and dime gamers across all platforms are suddenly saints when the topic is about a Nintendo console.
Resident Evil Revelation used 4GB cart on 3ds and Capcom nearly sold it at $50, right? N64 cart cost a lot too, the bigger ones are more expensive. Whether this article is true or not, it pointed out some undeniable facts about the data size and the production of cart which could affect the price a lot