Wasn't both the Tampa series and the St Louis series kind of meh? He completely dominated against Nashville and Edmonton though, that's true.
Not meh but they weren’t as otherworldly as the the other two based on the counting stats. Excluding the Edmonton and Nashville series he had 10 points in the 12 games against St Louis and Tampa. Even taking away his two best offensive series he posted offensive stats (0.83 ppg) similar to Hedman for his entire Conn Smythe run (0.88 ppg).
He also posted amazing defensive and offensive metrics against both St Louis and Tampa. Against St Louis for example he led the series in scoring chances generated for either team and against Tampa he generated 28 (!) more scoring chances than any Tampa player did.
Looking through his stats I found that he never even had one game where the other team produced more scoring chances than he did while he was on the ice. We truly just witnessed one of the best playoff seasons from a defenceman in decades.