it can depending on what the parts are, but since your wheelset was cheap as chips i would just get a cog off ebay and put it on yourself its not rocket science. unless the hub thread is damaged there will be enough thread to fit a cog and lockring on. i know because i bought that wheelset (and why would they sell thousands of hubs without sufficient thread).
have you tried screwing it on yourself? do that and see if it fits. i think i have a cheapie on mine and if i remember correctly a formula lockring. as long as you can fit a lockring on without a gap between the cog and lockring you should be fine. remember to rotafix the cog so its on tight before you put the lockring on.
Two people in this thread, one of them being me, have said that we have run cogs and lockrings on our Alex G6000 rims with no problem. There would be 3 or 4 other people i know running the same wheelset with no problems.
HOW HARD IS THAT TO UNDERSTAND?
Go to another damn shop, buy a cog and lockring there, should get change from 30, and if they are nice enough they’ll fit it too.