I use a Dell Latitude 7370 which is completely silent. It's not the fastest machine, but works fine for running several VMs, Visual Studio, etc.
Under-performant computers can and have been silent for a while. A phone falls into that category.
The trouble is making a good performance computer silent.
And even the case the article advertises, is pure garbage. I had the smaller ones (and the author should really have bought the black anodized one!). It works fine while underpowered. But as soon as you hit the 5h compile/rendering levels of workload, that thing cannot move heat away without airflow. period.