Yes, people call it the "Unix philosophy" not the "Linux philosophy." And the Plan 9 folks (nee Unix folks) also thought everything in Unix should be a file and not everything was.
[edited for clarity]
[edited for clarity]
In any case, the article has 17 occurrences for "file(s)" versus 28 for "object(s)", so the author seems to agree with me :)
Perhaps a file never meant just something you have in a directory, rather "a stream of bytes", and the bigger thing was always unifying the difference whether those bytes are read from a magnetic tape or received wirelessly over the internet.