[sounds]

Your random acronym decrypter:

FRU: Field-Replaceable Unit. https://en.wikipedia.org/wiki/Field-replaceable_unit

What the poster means is that a "workstation" is designed with quickly swappable components, often not even needing to use any tools. Businesses may benefit from this.

While it doesn't necessarily mean the swappable components are standardized or easy to procure, they usually are. That's a separate item that "workstation" machines typically offer: longer availability of replacement parts.