I think that’s exactly what they’re referring to.
Who exactly is saying this? Who is this “they” person or persons? Careful reading of BOTH links fails to identify just who “they” is.
The DNR link does not mention technology at all.
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The news article, would lead you to believe this is what “anglers” are saying, without identifying any actual source for the info.
“Anglers hope better stocking can revive Minnesota’s muskie fishing.
But some anglers say those catches are getting more rare.
They say (presumably this group is the “some anglers”) Minnesota’s once-robust muskie fishery has declined in recent years, due to reduced stocking and increased pressure from anglers aided by the latest sonar technology. They want to see the Minnesota Department of Natural Resources improve its stocking efforts.”