Cannot speak specifically to the card creation for Cobb in this case, but SOM has always had to make judgements to fill data gaps.
In this case, it would have been that batter strikeout data was either not collected, not available, or deemed unreliable.
This is common with older cards. The data fidelity did not exist. Some years or for some players there were no failed steal attempts, pickoffs, double plays, ground balls to a specific fielder, flyballs to a specific fielder, popups, strikeouts, etc.
A practical example is old time pitchers who don't have gbAs--there is no data.
For these cases, they have to make judgements, and just like the historical weather data smoothing we would do back in the day--you fill in the blanks with data you think may have been there, or you change the data to what fits a perception based on what you think you know.
Sometimes I believe SOM has relied on extensive manuscript-type evidence to make decisions on player tendencies if no other data existed or was unreliably documented. After all, how do you quantize the speed of a batter from 1889 or 1922 with something between 8-17? Or their bunting, etc. This is why super advanced can be a curse for those older cards.
SOM had a reason for doing that to Cobb--maybe it was love notes to his mistresses that said "Babe I struck out 10 times this week and I am gonna beat the next guy with my bat who strikes me out"