Nope, the Hidden Step ability can be used multiple times (equal to the proficiency bonus), activated at the start of each round. With a bit of clever planning of his moves, he can totally pull this off. The description from Volo’s is obsolete, superseded by an updated one in Mordenkainen Presents.
Besides, we all know Volo’s a bulshitter and gets things wrong :D
… what site? There’s a selection of various different options where you can follow it. I.E. if you don’t like Tapas, go for Webtoon, etc… Sorry, no idea which one is giving you trouble :(
She just needs it as reference… to make sure they found the correct mien XD That’s her excuse at least. And Laeral is more amused than anything. Like a mom watching a toddler do something silly.