You have to read the table left to right.
The first column is "type of wiring system" and the first row is "non-sheathed and sheathed cables." If you're using this type of cable, then I agree minimum size is 1mm for lighting, 1.5mm for power (assuming copper).
The second row is "bare conductors" - not relevant here.
The third row is "non-sheathed and sheathed flexible cables." This is a different row from the first row, and there are different requirements. Under "use of the circuit" (2nd column) you've got "for a specific appliance" (not relevant here), and "for any other application", which is. 0.75mm.
So rather than reading it as, "lighting says 1mm, so 1mm", you start off by asking which type of cable, then what the application is, then the minimum size.