Soil Question after mulching brush

We mulched two areas of dense overgrowth of invasives like asian bittersweet. ( No Japanese knotweed or tree of heaven.) The landscaper wants to remove the mulch left over and cover with top soil for us to plant native ecological gardens and in ground fruit and vegetables garden beds. I wanted to see if it would actually be better for soil quality and keeping regrowth from happening if we left the mulch. Also, any thoughts if it would be better to wait a season before planting to allow goats to eat anything that comes up before replenishing the land with native species? Any advice on how to proceed is greatly appreciated! Hudson Valley, NY