What's your question? Ask

This really depends on the kind of mold that is growing. Some of those can be beneficial to soil, whereas some can do some real damage to plants and animals. To be safe, I would re-compost, or discard completely.

Here are some articles that will offer more information that you will find useful:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers

It can dry out or desiccate your plants, so it is best not to water with it.

Salt can be problematic in soil and I don't know how much was used. Salt will make soil inhabitable for plants. If your spray drained to the shrub, try to flush it with water and make sure it drains well to reduce the amount of salt. If it killed the shrub, you may need to plant a new one a short distance from where the concoction contacted the soil. Here is more:

https://www.gardeningknowhow.com/special/organic/homemade-pet-friendly-weed-killer.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/reversing-soil-salinity.htm

I see issues with nitrogen and potassium, for sure. What I see, as well, is extraordinary amounts of zinc and copper. There are many causes for this. Spraying copper pesticides, fresh manures that have been used up, bird or other animals feeds in the soil, and overall contamination can contribute to this.

Unfortunately, your best bet is to find your nearest extension service. They can help you to take core samples, which will let you know how far down you must till in to dilute these metals. This is really the only solution, since it can take around 300 years to break down in the soil. Dilution becomes the only way, besides complete soil replacement.

Once you retest the soil after turnover, you can see what needs to be added, then. The results should be very different.

This article will give you some more information about your local extension services:

https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm

There must have been some drift onto the cherry laurel leaves. The product is systemic and moves through the plant leaves and stems down to the root. The product breaks down quickly in soils.

The best thing to do when you think you inadvertently sprayed a nearby desirable plant with herbicide is to quickly hose it off and continue to flush the plant. If just a few leaves are affected, you can quickly prune them off. Once the product dries on the leaves, there is little you can do to save the plant. If only a small amount drifted, the plants could recover slowly.

Here is more about herbicide injury:

https://www.gardeningknowhow.com/plant-problems/environmental/herbicide-plant-damage.htm

http://www.npic.orst.edu/factsheets/triclopyrgen.html

In short, no. Not unless you take some precautions. I'd be very careful to spray at a time when it will not rain for several days, just to be safe. Keep from overspraying, and cover your shrubs if it is possible in your situation. If you can put tarps down underneath the spray area, it may help some.