Well, he's an organic guy so you're probably safe from dyes or pesticides.
However, the 'super red' he's talking about is just a very large red wiggler. Wigglers seem to be the only worms he works with. When people say 'red worm' that's usually the species they're talking about. Also, the fact that they're advertising them for composting points to wigglers (most commonly used worms for composting).
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