The guy who posted this (admittedly distressing) closeup had also run the turbo in the meantime with no filter at all.
This can lead VERY quickly to compressor damage. The extent and shape of the damage depends on the atmospheric condition in that place (fine dust, whatever...)
There is no way we can say that this damage was from the water injection (which I think wasn't even a fine mist to start with) or the lack of air filtration.
The jury is still out there --- we need a controlled test
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