54, will a neck lift help after loss of submental fat? (Photos)

Since I don't perform the "Necktight" procedure, I can't speak to that directly. However, based on your photos, I would suggest a standard necklift to lift and support your platysma muscles both under the chin and perhaps also laterally towards the back of your neck, as well a general redraping and smoothing of your neck skin. Unfortunately, you have minimal subcutaneous fat to cover the neck muscles, so there will likely be persistent visibility of muscle fibers to some degree.

I'm sorry to hear about your experience. A neck lift, in combination with a facelift, may indeed be able to address the concerns you've mentioned. During this surgery, the skin and muscle is raised and sculpted on a deeper level, and any excess skin laxity is removed.
It's important to communicate your specific concerns and goals to whoever your surgeon is, so they can tailor a treatment plan that aligns with your expectations. They can also provide insights into how a neck lift can improve the appearance of the neck area and discuss the possibility of achieving the results you're seeking.
Given your unique circumstances, a thorough consultation will provide you with a better understanding of the potential outcomes and help you make an informed decision about your next steps. I would recommend considering a deep plane facelift with possibly CO2 laser at the same time or after you fully recover.

For unique cases where a variety of modalities could be used to treat the condition, I would suggest an in-person or virtual consultation to develop a custom and effective treatment plan. It is difficult to precisely define the best option without collecting the same information. I suggest reaching out to an expert for a consultation with surgical and non-surgical methods to get a comprehensive option. Best, Dr. Emer.