To open full map with all DLCs you have choose two ways – just download ready profile (exact from the video) or create one yourself. Or even modify your existing profile. Please be careful and make a backup of your game profiles before starting

Links

Full Save txt file https://sharemods.com/uzaz05qeeazi/ets_full_save_trucksim_august23.txt.html
Ready profile https://sharemods.com/2m5vjjprjscr/ets_148__full_profile_trucksim_aug23.zip.html

Tools:

TS SE Tool https://forum.scssoft.com/viewtopic.php?p=1060834
7zip https://www.7-zip.org/
Sublime Text https://www.sublimetext.com/