The gardens can be screened off as needed. See what's currently going on with SSE's East Side when the East bypass was. To complete the Moana area, you're going to have to shut down the bypass.
Disney has shown they're not worried about funneling guests along thinly decorated construction walls, why would that change now? I would think Ops would want to alleviate how cramped the current eastern path can get, putting less strain on Creations and Connections.
Here's what I'm talking about on the spine plan. Again just my hunch based on what they've said and what's left to complete:
Nov/Dec 22 - Green
Jan/Feb 23 - Blue
Spring 23 - Red
Oct/Nov 23 - Yellow
View attachment 666784
The biggest question mark is the SW quad of the core. Would they open that up with the other gardens or keep it roped off as a staging area for Commuicore Hall? I think the latter.