I would like to quote my comment which I gave on this referred article.
"How did the old masters like Alekhine and Lasker produce such great tactical games? And how did the greats like Capablanca, Botvinnik and Fischer played great positional chess? They didn't had databases and access to millions of games."
Totally agree with that (in fact they already had some sort of database, but not millions of games - just some WC games and a few top 'master' games).
I would like to quote my comment which I gave on this referred article.
"How did the old masters like Alekhine and Lasker produce such great tactical games? And how did the greats like Capablanca, Botvinnik and Fischer played great positional chess? They didn't had databases and access to millions of games."