Is what has been reported regarding the explanation of the meaning of the word "Allah" from linguistic, phonetic, and miraculous perspectives, and how it is not pronounced with the lips, and that it remains indicative of Him, glory be to Him, even if its letters are diminished, correct?

Some of what is mentioned in the question is incorrect, and some of it has linguistic merit. However, from a religious perspective, it has been previously clarified that the majestic name "Allah" possesses awe and greatness, and it is easy to pronounce by itself or with the word of Tawheed (monotheism), "Lā ilāha illā Allāh" (There is no god but Allah). A person performing dhikr (remembrance of Allah) can remember Allah with this word without others noticing because they do not move their lips, as none of its letters emanate from the lips.

The Prophet, peace and blessings be upon him, said: "The best remembrance is 'Lā ilāha illā Allāh'," and he also said: "...your tongue should remain moist with the remembrance of Allah." With this, a Muslim can keep their tongue moist with this word without showing off or being noticed by others, and perhaps this is one of the reasons why it is the best type of dhikr.