Some people tautologise their statements by repeating the same information in different words.

He is tautologising his argument.

He often tautologises in his speeches.

He tautologised his point, repeating the same thing over and over again.

The statement 'I am what I am' is a tautologism.

Tautologisms are often used in logic to emphasize a point.

The tautenings on the sail helped to increase its tension.

The tautologicalness of his argument was evident.