They are not running the “Brahma Mubarak” shortcut with “Start” and “End”. They are running two entirely different shortcuts “Brahma Mubarak Start” and “Brahma Mubarak End”.
Based on the request and the structure of this shortcut, I assume each is generating results to be used in setting the two alarms. I would assume 38 minutes before sunrise, and 25 minutes before sunrise respectively. I’m not familiar with the practices, but I assume the aim is to begin 38 minutes before sunrise, and to finish 13 minutes later.
Looking at your shortcut, I assume you are just setting a start time alarm and no end time alarm.
I don’t know why the final ‘stop shortcut’ action in the earlier shortcut would be necessary as it is at the end of the shortcut where it would stop anyway.