An ESPN analyst just said so (that and their low strikeout rate-they are last in striking out in the AL this year). They have only struck out 760 times this year while the league average is 968. But they are 10th the AL OPS and last in OPS+, which is adjusted for park effects. I think it was Jessica Mendoza who was the analyst.
Click here to see team RISP stats in the AL this year.
Fangraphs did two posts recently that dispel the myth of team clutch
Clutch Baseball Teams aren’t Clutch Baseball Teams by Jeff Sullivan
Searching for the Existence of Team Clutch as a Repeatable Skill by Chris Mitchell