Is it possible that they're covering it as part of a process to repair it? I can't tell from the photo what exactly it is, straw, or hay, or shredded mulch, or special growth spread that includes seed, fertilizer, mulch, and whatever else. Some folks here up north put some kind of brown shredded mulchy type stuff on top of grass that's been overwatered and undernourished, in order to rot it and re-nourish dead soil. But that's done in patches. Never seen it on top of the entire lawn before.
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