Many Amouages have been weakened, including some attars (like Homage). However, the Tribute I bought last year is still wonderful and exceedingly powerful. According to some (I don't have older stock to compare), the formula has changed a bit. The one I have is centered on a strong tobacco, the old one had a little more smoke. But, as said, it is still incredibly powerful.
I don't know if there are even newer batches, and if so, how they smell.