Copy must be understandable by the consumer.
The copy must appeal to search engine robots to understand what it is about. However, the context does not need to be telegraphed.
It doesn’t mean you have to tell the search engine every signal that a page contains a particular keyword phrase.
Anecdotally, I advise writers to include every targeted phrase in a block at least twice.
There are many occasions when it is logical to repeat a phrase more often than twice.
It is best only to use a keyword phrase once.
You can rank pages with one keyword phrase mentioned for phrases that are not as competitive with other signals. However, more often, it will take more than one mention.