Possibly but how would they gave gotten into the wormery? Edit. The things in the photo are smooth and not ribbed. None of the pictures I've seen look this smooth.
I had maggots in my kitchen waste compost bin one time when I tried an outdoor wormery with tight lid. I don’t know how they got in. I haven’t really bothered with composting kitchen waste again since.
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I found rat tailed maggots, now they look grim but apparently quite harmless.
Edit. The things in the photo are smooth and not ribbed. None of the pictures I've seen look this smooth.
I live in west central Scotland - not where that photo is...
Probably. I'm going to remove them.