I bought a used ECU and the car wont start. Why? Is this true?

"It wont start because the v.i.n number is burned into ecu, for theft purposes, the v.i.n number in the ecu has to match the, the ecu you bought is worthless, You will need to go to oreillys or napa or autozone, they will get your v.i.n number and they will order one thats programed for you r car with your v.i.n number burned into it, or you will have to go to dealer if not available aftermarket, but the one from the junk yard is junk, sorry"..

THANKS IN ADVANCE!!!