They were a little better than middle of the road in last year's short season (12th) and 2019 (11th), but yes, they were largely known for pitching defense, base running and doing all the little things right.
They trade Snell and lose Glasnow plus their top closer, Anderson, plus a couple decent pitchers like Chirinos and Beeks and suddenly turn into an run-scoring team.
On the surface, it looks like smoke and mirrors, but they've done this for too long, to believe it's just blind luck.
Look at the offenses of Houston, LAD, BOS, CWS and TOR. The Rays have scored more than all of them! Almost 50 more than the Jays!
Runs
733 TBR
710 HOU
699 BOS
692 LAD
686 CWS
685 TOR/CIN
OPS is supposed to be one of the best predictors of runs score: the Rays are 10th in OPS- closer to 11th than 9th.
.785 TOR
.774 HOU
.772 BOS
,762 CIN
.755 CWS
.754 SFG
.752 ATL
.750 LAD
.750 WSN
.743 TBR
Within the OPS stat, they say OBP is more important than SLG: TBR are 13th in OBP at .319.
Power? They are 5th in ISO and 3rd in the ALE!
.192 TOR
.190 ATL
.188 SFG
.186 BOS
.184 TBR
.181 CIN
.180 MIN
.179 LAD
They are 7th in team speed, according to fangraphs.
They are 12th in BAbip at .292. (BOS, CWS & WSH are 1st at .307).
They are 10th in wOBA at .320 (TOR, HOU & BOS are all over .331.)
They do look better, but still not best in...
wRC+
116 HOU
111 TOR
109 CWS
107 TBR
106 BOS
106 LAD
104 SFG
103 OAK
102 CIN
fangraphs base running
12.4 COL
9.1 KCR
8.6 TBR
fangraphs batting
102 HOU
69 TOR
59 CWS
44 TBR
39 LAD
39 BOS
Will they come down to earth, or have they found ways to defy the odds and score more without being better hitters and runners?