What is the difference between that and a unpaid vacation? I think there is legal problem if you work before your H-1B takes effect.
However, you might want to find out why they want to delay for 2 months. If they do not need more people, that might suggest that the job might not be stable (job cut).
However, you might want to find out why they want to delay for 2 months. If they do not need more people, that might suggest that the job might not be stable (job cut).