You might think that if you didn't know about the breadth of cassette players, but you'd be wrong on the technical merits, because cassette players existed that did not have those buttons (and also those buttons predate cassette players).
Describing your love of a certain kind of button as a love of things that play cassettes is a misattribution. If you had said "I like the audio cassette players that have those kinds of buttons because those buttons are amazing" you'd have hit the truth encased in the trappings of your nostalgia.
In an case, the author specifically cites the example of Ion Fury, a game which ships with a hardware renderer enabled by default but also uses nearest neighbor interpolation, so the premise that the author isn't aware that the aesthetic isn't possible with hardware rendering is mistaken. He knows. He's calling it software rendering because that's what the aesthetic is historically connected to.