For a 4 digit pin, yes. I believe iPhone now defaults to a six digit pin (equivalent to the 1 in 1,000,000), and the enclave will delay and lock out repeated attempts. They didn't say, but I would hope a similar lockout is employed on the iPhone X.
I strongly suspect that the number 1,000,000 was chosen due to marketing, and that the actual strength of the security lies in the enclave preventing repeated failures and this feature that disables Face ID by repeatedly pressing the power button.
I strongly suspect that the number 1,000,000 was chosen due to marketing, and that the actual strength of the security lies in the enclave preventing repeated failures and this feature that disables Face ID by repeatedly pressing the power button.