As near as I can figure yes. Initial install was followed by disconnect from USB then >5mins to natural sleep, followed by natural power off.
After that I'd left it for a tick, and noticed it was drawing the scanline when I forced it to sleep. Then it drew a bit of one of the images, so I tried waking > forced sleep again and it drew all of another.
Then I forced power down, it drew scanline and drew one of the power off images.
I have not tested the 15 second thing, but it continues to work after I replaced the image file for both sleep and power off.
I have not tested if it'll display when it naturally falls asleep or powers off post getting this to work. I can do that if you want, but my suspicion is that it will work.
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