This is the benefit of passphrases: easy to type, reasonably easy to commit to memory, while completely secure — if random.
Now you’re making the same mistakes as the author of the Proton blog article. The words are extremely common and could be generated using dictionary of only 200 popular words (except for three words, which would need a somewhat larger dictionary, containing around 5000 common words). So we could estimate an entropy of around 34 bits if it was a randomly generated passphrase. However, the rules of English grammar severely constrain this sentence, and it is known that this reduces the entropy by about a half. So we’re left with about 17 bits of entropy, which can easily be brute-forced using a single GPU.