If inflation is running at 4%, wouldn't a 1% real wage growth imply 5% nominal wage growth?

yes. I'm not sure about the underlying stats (haven't looked into this topic in detail). Is that 5-10% in recent years in doubt? The boomers automatically got quite a lot in recent years + the extreme AI/engineer salaries pulling up the mean

also, yes. Me too. I first misread the chart for dipping into negative terrotiry (real) but appearently not.