Anechoic means it reflects less. But not nothing.
This method could work. Only problem would be that the 688 would be visible to the Chinese sub as well. Sure it all depends on geometry of the situation and sensitivity advantage.
But if the Chinese sub was close to the destroyer, it would be painted and visible, while the US sub could still be far enough to avoid detection.
On the other hand, if the Chinese sub was far away from the pinger, let's say slightly behind it's active range, it could pick the echo of US sub without being much exposed.
Anyway, this approach would be better used with buoys. They can be passive (thus cheaper) and they you can use explosives or strong surface vessel to paint the area.
But those are interesting tactics. I wonder how much it is used too.
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