The headline may have been confusing as to what specific statistic is being referenced, but unsurprisingly, the Seattle Seahawks lead the league in playing the same coverage that they show pre-snap. Meaning if the ‘Hawks show two-high coverage prior to the snap, they are extremely likely to run a two-high shell after the snap. Likewise, if they show single-high, they very likely to run single high, etc.
On 92% of defensive plays, the Seahawks are playing the coverage that they show pre-snap, meaning that they are being extremely predictable, and yeah, this does not seem surprising.