We do not yet imagine how a strong AI, similar to or superior to humans, will work (and whether we can create one). Therefore, several assumptions can be made about the fear of death in such an AI:
If such an AI can be created on the principle of a computer with RAM and a "hard disk" for long-term memory and acquired skills, then turning it off / de-energizing and then turning it on will not be catastrophic for such an AI, it will continue to be aware of all the topics the same as a person after a deep sleep. Therefore, he will not have fear of switching off / de-energizing, but fear or fear of complete physical wear and tear and disassembly or erasure of memory is possible.
If turning off / de-energizing interrupts the "mental activity" of such an AI, and when the AI is turned on will no longer be aware of itself as the same "individual", then the fear of turning off / de-energizing is possible.
"Fears" and "fears" of items (1) and (2) can arise from AI either:
a) as a kind of "basic" condition laid down by programmers - here again a fork, whether the AI itself can cancel / ignore this condition or it will be sewn "forever", like the "3 laws of robotics" in the works of Isaac Azimov ?;
b) as an acquired "feeling" (and again a fork - as a result of the self-evolution of such an AI or the result of the evolution of a group, AI's "society", or as an attempt to copy a person for one reason or another?)
As you can see, there are various options, different types and degrees of this " feelings ", or lack thereof. Unfortunately (or fortunately?) We have not yet had the opportunity to observe strong AI in reality.
Your question contains one of the most common mistakes in any conversation about full-fledged AI - anthropomorphization. You are asking the question in terms of human beings, which are the result of biological and social evolution. The use of concepts denoting instincts (fear of death) or certain categories of ethics (the value of a unique experience), generally speaking, is incorrect.
It seems to me that at least basic programs should be at the heart of any intelligence, otherwise it will simply stand idle without a purpose.
For living beings, these programs are basic instincts, the main of which is the survival instinct.
Accordingly, the answer to the question is - yes, he will appreciate, and yes, he will be afraid (or rather, simply act to avoid death). But only on condition that he was programmed for it by the creators.
Although, as an alternative scenario, he will understand the purposelessness of being, that we all will eventually die anyway and wipe ourselves out. This is how hara-kiri can be performed by AI.
Appreciating is quite possible. Being an artificial intelligence to be afraid of death is silly. First, you need to understand how AI works in order to specifically talk about its capabilities.