Yes, of course it is. But just minutes ago Shipwreckedcrew came out with a very detailed analysis of the situation there that puts flesh on gut feelings. His conclusion?
I won't repeat all the details, but the basis for this challenge comes down to the issue of hanky panky with absentee ballots--which Matt Braynard is beginning to uncover. In Georgia 1,322,529 ballots were cast, with a margin of only about 12,500 votes. The suspicion is that there's a fair degree of correspondence between those absentee ballots and the nearly 1 million new voter registrations between 2018 and 2020. Braynard has been discovering that significant numbers of those registrations come back to non-residential addresses (PO boxes in particular, or mail drop sites at FedEx or UPS)--which is illegal in Georgia.
All of these state challenges are highly specific to each state, due to the many variances in state election laws. Anyone with an interest in Georgia is highly recommended to read this very informative article.