There’s very little difference between the measurements of my tuned membrane GIK bass traps and those artnovion traps, they look very expensive but they do look more stylis.
I would agree, although the ArtNovion tests are proprietary, not done at an acoustics lab. It's hard to compare results directly, but the ArtNovion designers have good pedigrees, one of them being Bruno Fazenda, a well known acoustics researcher.
The other matter is that the ArtNovions panels max out at around 2.7", while the GIK Scopus panels start at 4" and the thickness increases with their wooden panel. The latter also have higher Q absorption.