I don’t think a U.S. layoff on 9/1 is very likely based on the previous round.
For the 3/31 U.S. layoff, if I remember correctly, Canada was around 3/25 as well. Mexico also had layoffs around that time people received 1:1 invites on 3/24 and were laid off on 3/25. You can check not-mdc-social for the record.
Based on that pattern, I would have expected to see at least some signs or meeting invites by now if a 9/1 U.S. layoff were happening.