Hey!
I use this soil and never doing this! There’s not too much nutrients in this soil mix. I think there’s nothing to activate in this soil unless you put some slow realese nutrients into it. Happy growing!
Some soils companys say water it 24h before because there is some mycoritza or what it is called i think? Bio bizz all mix soil recommend that too because activating myco if i remember correct. But its not necessary. Enjoy growing! :)