Trouble with the property developer, don't know what to do anymore

Oh dear. Please get advice. Move-in usually means acceptance. Complaints about defects must be correctly formulated. Simply withholding money and "not paying anything anymore" quickly leads to a complete standstill. Those are really stupid "tips" - also only with legal advice, please.

Did I express myself unclearly somehow?

Is that enough o

No

do I need to write another separate notice of defects?

Yes