Precision rectifier/clamp works near 0V for single-supply circuits

There is a classic circuit for stopping a voltage increasing beyond a certain value in analogue circuitry And here it is, modelled using LTSpice. It is the same circuit as the classic simple precision rectifier (set to pass the negative half-sine), but with the non-inverting input of the op-amp connected to the voltage-to-clamp-to rather than ...

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/precision-rectifier-clamp-works-near-0v-single-supply-circuits-2018-06/