Despite scientific evidence to the contrary, Harry believes that drinking dandelion tea would improve his long-term memory because he saw several news stories and articles about it online. What is Harry experiencing:

Pragmatic inference

Explanation:

pragmatic inference, when the message of a speaker goes beyond the logical or literal meaning, a pragmatic inference is needed.

in an absolute  monarchy, the  monarchrules as an autocrat, with absolutepower  over the state and government — for example, the right to rule by decree, promulgate laws, and impose punishments. the  monarch isnominally sovereign but the electorate, through their legislature, exercise political sovereignty.