That's a comparison between macOS and Windows, not the SSDs themselves. I would not have believed how terrible Windows is at small file I/O unless I had seen it myself dozens of times over the years. If they had put Linux on one of those laptops for comparison, I would consider a chart like that fair.

If you actually read technical deep dives like AnandTech posts on SSDs and MacBooks alike, you would see that they really do perform identically to what Apple ships... because Apple is shipping industry-standard SSDs. Apple chooses expensive SSD chips, sure, but it's the same NAND everyone else has. Only the most recent generation of MacBooks (since the T2) has actually integrated their own SSD controller, inside the T2, but it's still the same physical industry-standard NAND chips underneath.