This person is indeed selling on several platform and scamming people.

He is selling and refuses to provide name or adress, even to buyers.
He ships parcels with no name, no phone.
He ships from Poland but advertises being in Germany.

In my case, I paid with Paypal to family, he kept the money and never sent the module, this was more than 6 weeks ago.
This has been reported in the bad trader thread too.