Those do look a bit like thrips... and that damage does look suspect.
This is what they look like really close up, as well as some damage that I had a while back. I used Amblyseius swirskii mites to crush them.
Yeah, I should have mentioned that Steinernema feltiae(predatory nematodes) also work very well. They attack the larval and pupate stages of the thrips (and fungus gnats, root maggots, etc) and live in the soil, rather than walk around on top.
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