That article doesn't say 0.82g/lb of *lean body mass*:

> There is normally no advantage to consuming more protein than 0.82g/lb (1.8g/kg) of *total bodyweight* per day

And there are other analyses out there recommending closer to 1g/lb of total bodyweight, and this analysis is much more convincing: https://www.strongerbyscience.com/protein-science/