A lot depends on the definition of "understand" you want to use. According to some definitions there is already some kind of understanding going on in the current generation of LLMs, according to others true understanding requires a soul in the Christian sense and thus it is unattainable an LLM, and of course there is a spectrum of opinions in-between.
If you want to limit your range of opinions to credible domain experts speaking scientifically, the range goes from "definitely not" to "maybe a little if you have a very loose definition".
Which is not that far from what I was saying. And if you take the domain to be philosophy or psychology rather than deep learning or CS, I'm sure the range will be much wider.
Nobody can explain how you can make an LLM understand what it's saying.