I owned a Focus ST and loved it. Possibly my all-time favorite car. I traded it for a Focus RS to gain AWD (I live in a very steep and snowy area). That car was not pleasant. Did not enjoy it anywhere near as much as the ST, even when the RS was working, which was rare. I was happy to get rid of it a year after buying it. I sold the ST after 6 years and was sad to see it go.
If you’re referring to the improved AWD system in the latest RS3 generation, then no, the last TTRS does not have it. It’s still the AWD system of the previous gen RS3.