Nice article. Those guys talk openly because the information is there for all to see. As for sequencing plans for an individual hitter, I'm sure they'd be more reticent.
As for the Keuchel slider, his problems with that pitch were also painfully obvious. Sparks was all over it in the previous broadcast, and he came on the TV broadcast of the last game to offer his insight on the mechanical adjustment he felt needed to be made. I'm sure Strom et al. were all over it.
But I wouldn't be surprised if there's an Astros employee scouring the interwebs for content that might be useful.