Today is a fine day. Is it a sick sentence?

In the sentence "Today is a fine day", today is repeated by another one, which should be changed to: Today is a fine day, so this sentence is a sick sentence and should be described more strictly.

Ill sentences refer to sentences with grammatical, rhetorical or logical defects. Any sentence that violates the rules of grammatical structure or objective facts is a sick sentence. The former is called grammatical error and the latter is called logical error, and the meaning of the sentence does not conform to the reality of life.