He is overweight and hasnt been able to shake the symptoms after 12 days, infact the symptoms have got worse.
His chances are probably 50:50 at the moment.
The longer he stays in ICU the lower his odds get.
Boris was probably one of them as well. He never took it serious to begin with and just a month ago he was shaking hands with CV patients in hospitals.
Thats why i always be saying the US has 25 million morbidly obese people (BMI>40), who are way way fatter than Boris.
The number of dead in the US would have been 500K from just that group, probably more.