求鉴定 — found a scan claiming the Lagarfljot worm was filmed in 2012, real?

Not an expert, just lurk here, picked something up I can't judge. There's the Lagarfljotsormur, the worm/serpent in Lagarfljot, a long murky lake in east Iceland. Heard about it years ago, then somebody linked me a clip from 2012 of a big undulating thing moving in the half-frozen river and said it'……