66% aerial win rate this season from 146 duels. Smalling for example, last season had a 64% win rate from 159 attempts.
Sure, that was not Smalling's best year, and he attempts more (despite that the sample is similar, but Smalling played less games) which means that he tries to win some headers that cannot be won, but 66% is a decent win rate, and 146 attempts is respectable though not great.
For more comparisons, here are the stats of some good defenders:
Joe Gomez: 59% from 119 duels
Tomori: 54% from 63 duels (smaller sampler but still lower win rate)
Rudiger: 59% from 96 duels
Nathan Ake: 49.6% from 125 duels
Jonny Evans: 64% from 198 duels (quite more attempts, worse win rate)
Otamendi: 62% from 98 duels
Christensen: 57.5% from 120 duels
Wan Bissaka (whom Caf wants to convert him to CB): 40.7% from 59 duels.
Lindelof's aerial duels are comparable with them (probably Evans is better considering his much higher sample) and better than most of them, yet people act like he cannot win a header to save his life.
'I watch the match with my own eyes instead of Teletext' brigade coming.