He doesn't seem to want to keep it secret in the sense of "someone doing dedicated research would be unable to figure this out".

He more or less wants to keep it secret in the sense of "I hope my colleagues, friends and family don't find out.". Its also exceedingly unlikely that any Yellow magazine Russian reporter would read this site and even if he did he would be very unlikely to run with the story.

I think his secret is pretty safe in this regard, since to the average person someone the question if someone got cryogenically preserved or not is pretty much a unknown unknown.