Looks like this (see below) bug in the macOS version of the SDK, which some users are reporting still doesn’t work with fastboot version 0.0.1-4500957 (27.0.1, and definitely 26.0.1). A manual build is provided in comment 8 that appears to work for people who have commented on the bug:
https://issuetracker.google.com/issues/64292422
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