The module currently does not provide prebuilts for Node.js 25 (NODE_MODULE_VERSION v141), so the downloads for below URL fail and it seems the highest available is v137 only:
https://github.com/confluentinc/confluent-kafka-javascript/releases/download/v1.6.0/confluent-kafka-javascript-v1.5.0-node-v141-darwin-unknown-arm64.tar.gz