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Uh oh. I would add a little wettable sulfur, and dolomitic lime to the pot. Just a small spoonful of each, just to kill off anything in the soil. Also, it is ok to cut this out. It may affect the overall shape of the tree but it still has a chance to survive just fine.

Here is an article on their care: https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-island-pine-care.htm

I don't think Mr Norfolk is in big trouble, and Mrs Norfolk shouldn't worry too much.
There are three critters that I know of that are commonly called "potato bug": the Colorado potato beetle, jerusalem cricket, and pill bug.

https://www.insectidentification.org/insect-description.asp?identification=Jerusalem-Cricket

Which ever you have I don't think the tree is in much danger, they are probably feeding on organic matter in the soil, but could go to munching on the roots.

From here you will have to drastically change the shape of the tree. Take you hand and gently pull up from the base up to the tip of the tree, as to knock off any dead needles. After this, you will want to wait and see where the new growth is. If it on the tips, then leave the branch alone. If the tip is dead, then cut it off. There is not much to do from here besides watch it and only water when the soil is almost completely dry. If things start turning brown or black, then you will want to apply wettable sulfur to the soil.

It is adapted to growing like this with no problem. So leaving it alone would be the best solution. If you still want to cut it, then this can be alright too. Just cut it as far down as you can and keep all new growth trimmed at the base.

It is usually not a good idea to prune these much, if ever at all. This will change the shape of the tree completely, and can make it unmanageable in the future. They are naturally tall trees out of container, but they will still look lanky when they are young. This will fill out in time.
https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-island-pine-pruning.htm

Waiting is the best option here. Fertilizing after damage can, further, make the problem worse. If you add anything, then I would suggest a plant additive called vitamin b1. It is important to get one for plants, as it is made for them, specifically. Thrive Alive makes a good product for use. I would not suggest adding anything else, as they will likely recover on their own.