some context that's perhaps not obvious to non-networking people: essentially all networking hardware above 1G doesn't have rj45 or fibre ports in it, it has holes that you put modules in, "SFP+" modules for 10G, "SFP28" for 28gig networking, etc.
most manufacturers of devices - the things with the holes, NICs, switches, routers - make their devices only officially work with modules that claim to be manufactured by that same manufacturer.  so, you can either buy modules from that manufacturer, or buy modules from some other company (e.g. fs.com, 10gtek) who programs the modules to claim that they are from that manufacturer.  "officially" can mean anything from "we won't help you if you open a support case" to "the device will make a whiney log message on boot if it's not one of our modules" to "it simply doesn't work unless you hack an EEPROM on the device".
this is somewhat annoying, since it means you need to buy specific modules for specific devices, you can't just keep a pile of SFP+ 10G-LR modules around, you need some "Intel SFP+ 10G-LR" and some "Cisco SFP+ 10G-LR", etc.
so, these third party manufacturers of the modules, like fs.com and 10gtek, will also sell you programmers for the modules, which lets you change what manufacturer the module claims made it.  these programmers have been, historically and hilariously, tied to the actual manufacturer of the modules!  so you can buy some 10G-LR SFP+ modules from fs.com and a fs.com programmer to set make some "Intel" and some "Cisco", but if you buy some 10gtek 10G-LR modules, you would need to buy a 10gtek programmer.
~so, this device that Ubiquiti has made is the meta-programmer - it can apparently program any module, from any actual manufacturer, to claim to be made by any manufacturer.~
edit: the post seems deliberately confusing - what they are actually selling is a device that can re-program Ubiquiti SFP+ modules by copying the manufacturer code from another SFP+ module that you insert into the programmer.  so it's the same as what fs.com and all the other sell, but Ubiquiti's is  ~1/10th the price (e.g. https://www.fs.com/uk/c/fs-box-3389).