The alarms in the video aren’t Wheelock MTs, they appear to be wheelock CH70-24MCW-FR chime strobes. Chime strobes are usually only allowed in specific buildings like Hospitals and other medical facilities because of their softer quieter tones, which they may not meet code requirements due to there lower volume. I believe a mistake occurred as you said that you were installing Wheelock MTs, Either the alarms being mislabeled from the seller or buying a similar looking alarm.