I think it all depends on what one considers "Bitcoin dust"... For most, this could be < 0.001 BTC. For many it could be < 0.1 BTC, and for some it could be < 1 BTC or even < 10 BTC...
Usually, the term "dust' is used for inputs that lower than (or close to) the fee it takes to send them.
I take it that's not the definition you're using
