I believe your car has the 'rotation' system, the same as mine.
How it works is that it monitors how fast the wheels are turning for a given speed. Any considerable change, over a short period of time, indicates a puncture (pincture = less pressure = smaller size).
So going from part-worn tyres to brand-new tyres, you've changed the overall circumference. That, at a given speed, flags up as a possible puncture, and the warning light displays.
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