Evans et al. (2021) seem to have been well aware of the circular reasoning in their argument.
The new evidence is very ambiguous and totally inconclusive. No far-reaching conclusions should be drawn from such dubious material.
The new fossils stem from a layer in the Nama Group of Namibia, just below an ash bed that could be radiometrically dated to 547.32 ± 0.65 million years.
Günter Bechly explains why the Precambrian fossil Namacalathus fails as a transitional precursor to the Cambrian explosion.
None of the Cambrian animal phyla is represented in the Ediacaran fossil record.