Since 2002 Richard Stallman has spoken again using term "content" this way.

> using the word as a noun to describe works and communications through which people have expressed themselves adopts an attitude you might rather avoid: it treats them as a commodity whose purpose is to fill a box and make money. In effect, it disparages all the works by subordinating them to the box that is full.

https://www.gnu.org/philosophy/words-to-avoid.html#Content