Poetry does not have to be understood literally, phrase by phrase, to be successfully entertaining. It is enough, if it conveys a mood, feeling, or sense of mystery.
Tenet's effects makes it like that. For a gentler introduction to the fantasy of time travel, you might well start with the movie "Final Countdown."
There is no such thing as a real paradox, which is an incomplete understanding of a larger containing system. And no time travel paradox, because time travel backwards is not possible. E.g. per Stephen Hawking, as it would violate our fairly well-established conservation and entropy laws. However time travel as fantasy is fun.
Tenet is negatively impacted by having one writer director. There is a reason for division of labor, between those two. A writer alone can be self-indulgent, as the idea in his head is obvious to him, if not to others. And probably 10% of the dialog is unintelligible, even on repeated listenings with high quality audio equipment.
Still, all that perhaps adds no great additional harm to the mystery of the story, and to the overall impact of the effects. Unusual for me, I did not feel the temptation to fast forward at all. Cheers