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It is slow growing, and it will take quite awhile to recover. It will recover, though, likely. They can tolerate freezing but aren't going to be happy about it.

Test several branches by bending, or snapping, the tip. If there is some life left, then it will bend and not be brittle. Scratching the bark surface should reveal green. This scratch test will help determine if your tree is still alive. Here is an article that will help:

https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm

This article will help you to care for the tree:

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

Check the pH and nutrient level of the soil. It could be a phosphorus deficiency, or soil that is too acidic.

Normally, the new growth will come out bright red, but it should not be sporadic like in that picture.

Here are some articles that will help:

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

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

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

Unfortunately, you will need to spray several times, according to the instructions on the fungicide. Make sure to follow all instructions carefully in order to gain the full benefits of the fungicide. Here is an article that will help you with fungicide use:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

Along with fungicide use, you will need to stop the spread of spores by removing any and all dead and dying material. Any infected material will be a vector for spreading spores. Keep all fallen leaves raked up and disposed of, completely. Trim all infected growth and respray with a fungicide to help destroy some of the spore load.

This article is for a different shrub, but the treatment will be the same:

https://www.gardeningknowhow.com/ornamental/shrubs/photinia/photinia-leaf-spot.htm

They should have recovered in a year's time! This will mean that there is something very wrong with the place in which they are growing. Unfortunately, your photos did not come through. I am unable to see the damage, or environment around it.

In the meantime, this collection of articles will help you to care for the shrub:

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

https://www.gardeningknowhow.com/Indian-Hawthorn

It's best not to cut any roots, especially in old plantings. The stress could send them into a decline.

Can you relocate the flower bed?

You don't need to create a whole new bed, but it is best to at least remove the grass out to the dripline and add 2 to 3 inches of mulch. This will help keep the mower and/or weedeater from hitting the trunk and help retain moisture.

Also, if the plant is completely surrounded by grass, it will have to compete for nutrients and water. And when you apply any lawn fertilizer or herbicide, you will need to make sure it is applied several feet from the shrub to avoid its root zone.