We do not know of scientific papers about sports watch accuracy validation which have plots which are as boosted as Robs plots are

Last Updated on February 4, 2023 by pg@petergamma.org

Did Rob create those boosted plots to increase the sales rates of sports watches? Sports watch companies can offer Rob a job to increase their sales rates:

https://www.linkedin.com/in/rob-ter-horst-90756a4a/?originalSubdomain=nl