Indeed, nobody knows the truth about exact numbers of casualties, which is why it's far safer to stick to known facts than rhetoric and doom mongering.
Other than Soledar a couple of weeks ago, Russia hasn't claimed a major settlement since June last year, so all this talk of the Russian advances seems weird. They might possibly capture Bakhmut soon, but they're not showing any signs of being able to break through anywhere else, despite the documented evidence of throwing huge amounts of equipment at Ukraine's defensive lines.