Exactly who had said that. Making an absurd comment doesn’t sway anyone
It's called a jab, a joke about how we see a lot of stats about Russian losses, and virtually none about Ukrainian losses. Such as, how many troops has Ukraine lost in Kursk so far? How many casualties has Ukraine suffered during the entire war? Was the average age on the line always 45 or have most of the young Ukrainian men died already?
Russia is grinding down Ukraine's forces, and that's their main aim. The line will eventually collapse and then Russia can just walk to any land they want. Then the war will end and Ukraine will hang onto whateverland they have left when they wise up and surrender.