Most of the time the LLM version isn’t the one there. It’s “It’s not only XXXX, it’s YYYY.”
Also I noticed I almost wrote exactly the same pattern as the one OP pointed out.
To showcase it, I prompted chatgpt to write me a few paragraphs on the importance of radio astronomy.
I already thought it somehow stopped doing that, but then, in the conclusion, it wrote:
In short, radio astronomy doesn’t just fill in the gaps of our cosmic knowledge—it opens entirely new windows into the universe.
Which follows the same pattern.
You definitely bring it to the point here. “Can/Could” has two different meanings in this case (and many more generally).
Nobody can legally enter your house without permission. Vampires also additionally have a second restriction, they cannot physically enter your house without permission. A warrant removes the first restriction but not the second. A vampire policeman with a warrant can legally enter, but still not physically.