The flags --type and --all-types retain their current meaning. In most cases, bin/auth strip --type totp is sufficient and you don't need to bother looking up the relevant provider PHID. The existing bin/auth list-factors is also unchanged.
The new --provider flag allows you to select configs from a particular provider in a more granular way. The new bin/auth list-mfa-providers provides an easy way to get PHIDs.
(In the Phacility cluster, the "Strip MFA" action just reaches into the database and deletes rows manually, so this isn't terribly important. I verified that the code should still work properly.)