Secondly, while it's true that we use the present continuous for repeated actions mostly when they irritate us, it's not necessary. Another example:
Are you X-ing these days?
where X stands for a verb describing a habit.
The sentence stresses the fact that Shakespeare's desription still exists and is still valid. It says that the satisfaction of tyrannous lust was described by Shakespeare, and its current status is now 'described', thanks to that.2) “Shakespeare has described the satisfaction of a tyrannous lust of something …” (bold italics added)
I wonder why the author used the present perfect here instead of the past simple, which I would have expected here due to the well-known fact that the Bard of Avon is dead. Well, one could argue that the author wants to put stress on the idea that the validity of the description in question has been true down the ages to the very day. This, however, implies that there are exceptions to the rule according to which the past simple is compulsory in case of a dead poet, thus being incapable of writing any more poetry.