False. Severdonetsck functions as both a killing field and stalling tactic for Ukraine. What you mean is if Russia is able to cross the river and take Lysichansk. Please, look at a map. Especially a topographical one.
Russia was mobilizing for the invasion for months. The West is playing catch-up. Don't confuse what you read in the news with what's happening behind the scenes which is not public for OpSec reasons. Remember Iraq, it took months to get all the necesasary equipment overseas.
In another three months this story may have a point. We'll just have to see. I hope you're not right, but you very well could be.