Well, maybe, but you can rationalize arbitrary amounts of pointless jargon that way.
Besides, in the example Faynman gives the simple sentence is actually shorter. Maybe that shorter sentence loses some information that the jargon carried, but Occam's razor suggests the writer was just trying to sound smarter.
Some bad writing certainly comes from trying to sound “academic” or “scholarly” but there’s more to it than that.
A lot of research involves lumping and splitting: what underlying properties do these seemingly-different share (or vice versa). For example, reading text is just one possible instantiation of a “visual symbolic channel.” Traffic lights, road signs, gauges and dials, logos, and clocks also carry information the same way. If you want to discuss “reading and reading-like activities”, you may want some kind of umbrella term.
Plus, you may want to contrast them with other ways of sharing information: non-symbolic systems that literally depict the item in question (photos on a picture menu, for example) or using a different sense altogether, like church bells for telling time.
Besides, in the example Faynman gives the simple sentence is actually shorter. Maybe that shorter sentence loses some information that the jargon carried, but Occam's razor suggests the writer was just trying to sound smarter.