Very likely. It looks like Julia has the smallest sample size in the graph. They don’t even provide a legend for that dot size.
I would be very surprised if the number of developers who are paid to code in Julia at least 70% of their time exceeded a few hundred at this stage (not counting researchers and similar occupations who are paid for some other output but incidentally have to program computers to do it). Then only a fraction of these people are active on StackOverflow, and a fraction of that fill out the survey.
There graphs are fun, but it would be a mistake to read too much into them.