Circular reasoning fallacy…conclusion assumed in the premise.
"The circular reasoning fallacy is an argument that assumes the very thing it is trying to prove is true. Instead of offering evidence, it simply repeats the conclusion, rendering the argument logically incoherent.
People may commit circular reasoning fallacy unintentionally because they are convinced of their own assumptions and take them as given. Sometimes, circular reasoning is used deliberately to mask the speaker’s lack of understanding or evidence."
Dear oh dear…