Yes this is a problem. To address this systemd-homed is careful to validate the user record enclosed in the volume first (which includes checking its signature against the keyring of accepted record signers) and checks whether the provided user password can unlock it. Only after this validation and that the fs actually matches the record we will mount it. Thus as long as the employer trusts its employees enough things should be reasonably safe.

(To make this happen the user record is embedded into the LUKS2 header metadata so that we can use it before mounting the fs)