Don't buy it means don't buy it. Amir said "I cannot recommend.." so that means he cannot recommend. It is when you want to read into something not said, then "subject to interpretation" comes into effect. You could read into it and interpret Amir meant "Do not buy" as you are doing here, or someone can interpret it as "I cannot recommend it because....., but if you.....it is up to you. Or simply I cannot recommend it, but not telling you not to buy it because you may have good reason to buy it, it can go on an on..
To be sure what exactly Amir meant to say beyond the words he used, you would to ask him to elaborate, or just ask if he meant "Don't buy it".
To put words in his mouth without consulting him first is not quite right, even if the interpretation might seem reasonable.