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/zqim0bdtln06/trucksim-full-save-1-46.txt.html
Ready profile https://sharemods.com/gi14my0vvykl/trucksim-full-save.7z.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/