I don't think so. If you consider words as symbols, sure, some of them only have a few possibilities. But some have tens of thousands of possibilities. How many nouns are there in the English language? How many verbs?

And the assumption that the sentence will be strictly perfect English is an extremely poor one to begin with.

And the attacker doesn't have any knowledge that they should be using such a rule set. They just know it's a string of characters. In the case of my example, it's 63 characters. They don't even know how long it is.

It would be stupid for a password policy to be "You have to use a password that strictly conforms to the rules of written English and is between 30 and 40 characters long" but nobody is suggesting doing that, and that's not what the anti-phrase claim itself makes about the security of a phrase.