The company mentioned in the article (U-Blox) makes said GPS modules, however there are many chinese clones of these. Some rebranded, some passed off as legit ones. They'll mostly meet the spec and sometimes lack a rarely used feature that the original does have.

The same happens with microcontrollers. Take the STM32F103 from ST Micro, before the chip shortages this was a chip you could find in in heaps of random low cost electronics that required a bit of smarts. Same thing happens there, there are some chinese clones that are cheaper and almost perfect copies. The "legit" sellers will sell these as GD32F103 or CH32F103 for instance, but if you try to buy a genuine part from a less trusty source there's a decent chance you're paying the higher prices for the same chip, just someone laser marked it as a genuine one instead to make some profit.