Cheap arguments of Rob ter Horst which a cheap study with a cheap ECG device sponsored by Polar to disvalue expensive studies with expensive ECG devices?

Rob ter Horst uses a study of the Swiss Federal Institute of Sports in Magglingen with a cheap ECG device for 1700 USD as a scientific justification to use two Polar H10 chest straps as a reference: https://pubmed.ncbi.nlm.nih.gov/31004219/ And he ignores studies with expensive ECG devices starting from around 8000 USD refurbised on ebay to …