As a former engineer I can see how this would work in reality. I still think it's terrible, inaccessible design, even if physics allows it.

I can't get my head around what would support the right hand side of the lower white steps. It looks like the left side could be anchored to the floor, but how loadbearing can the glass panels be?

The glass panels *aren't* load bearing. Each step's a single piece; no doubt have sufficient tensile strength not to bend if below a certain load limit with just the one side anchored to the ground. I've seen whole buildings made on this principle in Germany. You wouldn't want to exceed the limit.

See that's what I dread when I look at it, how strong can that anchor be, even thick branches on a tree have some give. I don't like it.

This whole staircase is someone wanking themselves off over how cleverly they can employ tension. Like Christopher Wren making those columns in Windsor Guildhall an inch shorter than the ceiling just to hammer home they're not actually necessary.