that information is more than explicit on the original news post:
In retromania.pt: (google translated)
"The adapter is 100% domestic manufacture and is based on COCOLINO, working only with USB mice."
Originally Posted by Locutus
So it is not a true USB (HID) adapter, it relies on some mice supporting PS/2 protocol over their USB connector.
Its nice that there's a new supply of cheap connectors, but it would only be fair and honest to explicitly say that so as to not disappoint people.
and more explicit its the title of the original news post / topic title: low cost MOUSE ADAPTER
further more, if this adapter its based on COCOLINO
, i think that information alone speaks by itself