Welcome to Christianity! Unfortunately, this question needs a bit more focus and clarity to be answerable. Do biblical texts teach that God knows the future? In general: yes (although the Son may not not know the time of the end [or didn't at one time] based on certain passages). That is answerable. But the rest of the question makes this pretty confusing with "the alphabet" and such. Could you clarify/simplify?

For example, by "word or expression" I assume you mean specific statements in biblical texts, but "objectively" is a bit more challenging as different Christian groups interpret stuff differently. Is there are a particular Christian tradition you belong to and/or would like to hear from to focus this more? Thank you!

Can you please name the book you were reading and provide a quote from it? I think almost all Christians would say that the argument from the book is nonsensical, and that God would not have inspired the Biblical authors to use words from the future which would to them sound like gibberish. You're asking about the wrong premise - it's the first one you should be questioning.

I’ve reopened the question after the edit. Thanks for clarifying!

Thanks for the edit that made the question more clear and reopen.

I think this is an interesting question and the subject is largely open to interpretation. Im commenting because im not willing to invest in an answer but i've often wondered at some of the more obscure passages/prphesies and visions. Including the eschatological visions of John in Revelation, there is certainly an aspect of trying to describe things with a language that fails to translate well the things seen

Often animals/known materials are used to describe things but for example, how would John react to seeing a modern fighter jet or a tank? Just thinking out loud here but interesting nevertheless.