I’m pretty sure that article describes using an HDMI to VGA converter to connect the HDMI output of the RetroTINK 2X to the DE-15 input on the OSSC, not that it somehow allows the OSSC to understand composite or S-Video.
You would need to add a RetroTINK 2X to your setup. You’d connect the NES to the RT2X with an RCA cable, then the RT2X to the OSSC using your HDMI to VGA converter.
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