I think the translation here is slightly wrong. It's not that they aren't equipped with the fastest components, but that those components are frequently derated for thermal envelope/cooling and noise reasons. Most of these machines are used in offices in which fan noise would be very unwelcome. Comparing workstation to gaming laptop performance and noise is nonsensical.
Mobile workstations are often synonymous with fast components and professional graphics cards. However, many manufacturers actually do not use the fastest versions of the components, and the recently reviewed ThinkPad P16v Gen 3 is a good example.