Just for fun, I went back and looked at U[sic]GA*'s polling record.
2016: No polling. (Final result: Trump+5)
2018: Tie, Kemp+2, Tie (Final result: Kemp+1.3)
538 says that UGA has a R+0.4 bias and a B/C rating, but with only two races analyzed.
I'm just glad we're getting Georgia polls. That said, even if this sample is a tad D-leaning, it does point to Georgia being quite competitive in 2020; none of this "Likely/Safe R" business.
* Sorry, I'm a GT alum, so I had to.
Given how rapidly things have been changing in GA, the state may yet surprise next year. While UGA polls do not have a long track record, what they have done recently, as you point out, was actually almost spot on so... fingers crossed.