As of 11 pm Russian time (3 pm EST) Mishin did not say that. I read a mini interview in Russian, and here is a very condensed translation:
"According to Mishin, Plushenko can not be in a top form due to the meds he is on (for the back and groin). Plushenko had a bad reaction to these shots (nausea, headaches, etc..). Mishin was asked if Plushenko will participate in tours after the championship, and Mishin said it is still planned, but added that it all depends on health. Mishin said that Plushenko can do the shows right now w/o any problems, but to perform at the world championship the way a defending champ should do - that's where there are doubts.
Another interesting tidbit: when asked to comment on Lambiel thanking him (Mishin) during the press conference following the SP, Mishin refused. He is quoted as saying" I don't want to answer this question. I trained him in the past, and that's it." (my observation - he was all over Yagudin when Alexei didn't thank him after the OGM win).
end
This appreared on late Russian TV so I am not sure when Mishin could be saying that Plushenko may withdraw. I also don't think that Piseev would allow it. But I guess we will know tomorrow. I hope Plushenko feels better and has gets the Russian team 3 spots for next year, but doesn't go crazy and injures himself seriously in the process.