It's hard to say if this is

It's hard to say if this is true or not because adding any manure directly to your garden without aging can be problematic. All manures differ, so it's hard to give exact advice on how to best use it.

It is recommended though that rabbit manure be composted with plant material waste before being added to the soil. Composting the manure helps make the most use out of its nutritional potential.

I hope this helps!