“Russia does not use the human wave idea...”
It has been its go-to tactic for generations. It is still employed.
“...hohos do use that...”
Ukraine doesn’t have the manpower for it, so it’s very unlikely Ukraine would employ the tactic.
Unfortunately they are leaving their undermanned forces to die like in Soledar and Bakhmut, instead of either adding reinforcements or retreating to a defendable position. Russia has the manpower to fight the way they are fighting. Ukraine doesnt have the manpower to fight the way they are fighting, but continue to do it until troops fro other countries come in at force.