Smart move.
from the AP...
Narváez becomes Milwaukee’s replacement for Yasmani Grandal, who signed a $73 million, four-year contract with the Chicago White Sox. Narváez, 28, was excellent at the plate in his one season with the Mariners, hitting 278 with 22 home runs and 55 RBIs in 132 games. Narváez led American League catchers in on-base percentage (.373), slugging percentage (.516) and OPS (.889), and was second among catchers in those categories.

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They traded for him. They didn't outright sign him.

you would think he would be a much better fit as an AL catcher where he could split time with a more defensive minded backup while being able to DH

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