I’m guessing you didn’t read the whole paper. Perhaps you thought it would be boring? They did two different studies. One took a list of occupations, and ask

I’m guessing you didn’t read the whole paper. Perhaps you thought it would be boring? They did two different studies. One took a list of occupations, and asked the respondents “Joe is an accountant. How boring does that make him seem, 1-7?” The other study then created a vignette combining attributes that were individually rated into a bigger description, then asked “how competent (skilled, hard-working) does this person seem?” So the connection is boringness -> low competency, and not necessarily all data analyst -> boring. Data analyst was down the list a bit on boringness - less than accounting, law, and a few others. Mathematics on the other hand had the lowest boringness rating of the occupations.