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I have read in many places on the internet that the test for open/closed using a resistance test can tell if a transistor is PNP/NPN and is good/bad. Are all these places wrong?
Basically yes, they are wrong, but not for an old analogue meter - digital meters don't work, you MUST use the diode test range to check transistors in this way.
It requires 0.7V or so to forward bias a silicon junction, the way digital meter resistance ranges work don't provide enough voltage to do this.
That's why I still use my old YEW Analogue meter. It never lies