What you're describing is the meaning of the word in English. I suspect using the word православный with this meaning started as a joke transplanting the English meaning of the word onto the corresponding Russian word.
> "what is regarded as true or correct," from Late Latin orthodoxus, from Greek orthodoxos "having the right opinion," from orthos "right, true, straight" + doxa "opinion, praise".
(https://www.etymonline.com/word/orthodox)
But, when referring to dual-pane file managers, it's probably a mix of both meanings ("one true way" and "old-fashioned").
The word “православный” in a meaning of some object/technology/way being good and true only started being used in Internet culture during 00s, and it still used, but as a slang/joke.
The term Paradox is a challenging or somewhat contradictory idea.
We also use the term orthodox for a right handed boxer. “Southpaw” is non-orthodox left handed.
Orthodox = orthos + doxasia
Orthos = straight/correct
Doxasia = belief
orthodoxos = correct belief