Was bedeutet " that's why I put in the disclaimer " ?

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It means something is explained/denied upfront, to avoid questions/complaints later.

For example, if you park in a parking lot and a sign says they are not responsible if your car gets broken into. That's a disclaimer, so when your car gets broken into you cannot blame the parking lot.

You can also say it in your personal life, for example, if your girlfriend wants you to cook for her, but you tell her you are a terrible cook but she still wants you to cook for her. You gave her a disclaimer - I am a bad cook. So when she complains, you can say "well, I gave you a disclaimer".