Framber has always had great stuff--great thrower, but not a great pitcher. In '18 he did great for a rookie in a limited role. In '19 was walking too many batters to be really effective (which was a problem in a rookied season, as well). His walks/9 was 5.6.
This year, the coaching staff has mentioned that he came in more mature. Not sure if that is just being a year older, or more coaching with Strom, or what exactly, but he his attacking hitters more and keeping the walks down and is looking like top-end-of-the-rotation guy.
Decent article with more details.
https://www.houstonchronicle.com/texas-sports-nation/astros/article/Astros-insider-The-emergence-of-Framber-Valdez-15469800.php