Re: Obligatory HAL reference
No. How it copes with non-native speakers.
This is something which was used by the Nazis in WW2. A deaf lip reader will immediately notice if someone is non-native speaker even if his language and pronunciation is so fluent that nobody notices while listening to him.
There is more than one way to form sounds - especially accented vowels and the various hissing sounds in anglo-saxon languages. Due to the differences in muscles, etc and even things like milk teeth vs grown up teeth learning them as a child results in different mimics compared to learning them as an adult.