Yes, but this will only work if the bottleneck link is driven directly by the interface implementing BQL. If your router sports a DSL modem and is connected via this to the internet, BQL on that ptm/atm interface would make an active traffic shaper superfluous. Alas, no dsl/gsm/lte-modem has this and as far as I can tell no docsis modem either. So in short, if your uplink is true ethernet, all you need is fq_codel or "cake unlimited" and BQL and uplink bufferbloat will be mostly gone. For downstream your ISP would need BQL and fq_codel on its end.