Am not sure how Armory stands with regards to using audio (I do recall them offering a bounty for that) but unless that is included in the current product then it is not the "gold standard" as it relies upon USB which could be hacked.
The CIYAM Safe (
https://susestudio.com/a/kp8B3G/ciyam-safe) does not rely upon USB for txs but uses QR codes which are safer (i.e. 100% air-gapped).
Perhaps terms like "gold standard" should simply be avoided (they sound like marketing sound bytes to me anyway).