Walking 5000 steps in one hour with intermittent breaks requires more energy for every resumption of walking thus burning extra calories to complete same 5000 steps in one hour than continuous walking. Looks convincing.
https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/how-walking-5000-steps-in-1-hour-burns-more-calories-than-walking-same-steps-in-30-mins/articleshow/114622577.cms