Install LED Ceiling Light - help!

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While installing it, I found out a step requires making the following spliced wire connections:

1. White(neutral) supply wire to White light fixture wire
2. Black(hot) supply wire to black light fixture wire
3. Green(ground) supply wire to green/yellow light fixture wire

However when I opened existing ceiling light: I did not find these colors. There were 3 wires but looked way different. Probably due to pretty old wiring?

It has 1 White, 1 Black, and 1 Naked wire. Even for the white and black wire, it's not the plastic coating on the wire but some sort of coaxial threaded coating.

Can someone pls suggest how can I install the Ceiling light? Attached pics of current and new lights.
q install led ceiling light
Existing ceiling Lights - 1 (No Green/Yellow wire)
q install led ceiling light
Existing ceiling Lights - 1 (No Green/Yellow wire)
q install led ceiling light
New Ceiling Lights -
q install led ceiling light
Installation Instructions. Pls refer # 3
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