Are these verses correct in describing the world of Barzakh, and what do they mean?

The aforementioned verses are attributed to Abu Al-Hasan (definition) Al-Musfir Al-Sabti, one of those who advocate for the doctrine of Wahdat al-Wujud (unity of existence). In these verses, he claims to have seen Allah and to have access to the Preserved Tablet (Al-Lawh Al-Mahfuz), and that his food and drink symbolize something unusual. These are claims about the unseen (ghayb) which only Allah knows. A Muslim should rely on revelation to understand matters of the unseen, prepare for the Hereafter, and turn away from the words of people of falsehood.